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 2019 1. Dorodnitsyn, Vladimir A.; Kozlov, Roman; Meleshko, Sergey V.. One-dimensional gas dynamics equations of a polytropic gas in Lagrangian coordinates: Symmetry classification, conservation laws, difference schemes. Communications in nonlinear science & numerical simulation 2019 ;Volum 74. s. 201-218NHH Untitled 2. Dorodnitsyn, Vladimir A.; Kozlov, Roman; Meleshko, Sergey V.; Winternitz, Pavel. Lie point symmetries of delay ordinary differential equations. I: Nonlinear Systems and Their Remarkable Mathematical Structures: Volume 2. CRC Press 2019 ISBN 9780429263743. s. 89-118NHH Untitled 3. Kozlov, Roman. Conservative difference schemes for one-dimensional flows of polytropic gas. Communications in nonlinear science & numerical simulation 2019 ;Volum 78. s. 1-8NHH Untitled 2018 4. Dorodnitsyn, Vladimir A.; Kozlov, Roman; Meleshko, Sergey V.; Winternitz, Pavel. Invariant solutions of delay differential equations. AIP Conference Proceedings 2018 ;Volum 1978.(1)NHH Untitled 5. Dorodnitsyn, Vladimir A.; Kozlov, Roman; Meleshko, Sergey V.; Winternitz, Pavel. Lie group classification of first-order delay ordinary differential equations. Journal of Physics A: Mathematical and Theoretical 2018 ;Volum 51.(20)NHH Untitled 6. Dorodnitsyn, Vladimir A.; Kozlov, Roman; Meleshko, Sergey V.; Winternitz, Pavel. Linear or linearizable first-order delay ordinary differential equations and their Lie point symmetries. Journal of Physics A: Mathematical and Theoretical 2018 ;Volum 51.(20)NHH Untitled 7. Kozlov, Roman. Lie point symmetries of Stratonovich stochastic differential equations. Journal of Physics A: Mathematical and Theoretical 2018 ;Volum 51.(50)NHH Untitled 8. Kozlov, Roman. Random Lie symmetries of Ito stochastic differential equations. Journal of Physics A: Mathematical and Theoretical 2018 ;Volum 51.(30)NHH Untitled 9. Kozlov, Roman. Symmetries of Itô stochastic differential equations and their applications. I: Nonlinear Systems and Their Remarkable Mathematical Structures: Volume 1. CRC Press 2018 ISBN 9781138601000. s. 408-436NHH Untitled 2015 10. Dorodnitsyn, Vladimir; Kaptsov, Evgeny; Kozlov, Roman; Winternitz, Pavel. The adjoint equation method for constructing first integrals of difference equations. Journal of Physics A: Mathematical and Theoretical 2015 ;Volum 48.(5)NHH Untitled 11. Kozlov, Roman. On first integrals of ODEs admitting λ -symmetries. AIP Conference Proceedings 2015 ;Volum 1648:430005.NHH Untitled 2014 12. Winternitz, P; Dorodnitsyn, V; Kaptsov, E.L.; Kozlov, Roman. First integrals of difference equations which do not possess a variational formulation. Doklady. Mathematics 2014 ;Volum 89.(1) s. 106-109NHH Untitled 2013 13. Kozlov, Roman. On first integrals of discrete equations with symmetries. AIP Conference Proceedings 2013 ;Volum 1558. s. 475-477NHH Untitled 14. Kozlov, Roman. On symmetries of the Fokker-Planck equation. Journal of Engineering Mathematics 2013 ;Volum 82.(1) s. 39-57NHH Untitled 2012 15. Kozlov, Roman. On Conservative Discretization of the Kepler Problem. AIP Conference Proceedings 2012 ;Volum 1479. s. 1299-1302NHH Untitled 16. Kozlov, Roman. On symmetries of stochastic differential equations. Communications in nonlinear science & numerical simulation 2012 ;Volum 17.(12) s. 4947-4951NHH Untitled 17. Kozlov, Roman. Sparse spectral discretizations for some parabolic PDEs. Analysis and Mathematical Physics 2012 ;Volum 2.(4) s. 439-446NHH Untitled 2011 18. Kozlov, Roman. First Integrals of Discrete Hamiltonian Equations. AIP Conference Proceedings 2011 ;Volum 1389:490. s. -NHH Untitled 19. Kozlov, Roman. ON LIE GROUP CLASSIFICATION OF A SCALAR STOCHASTIC DIFFERENTIAL EQUATION. Journal of Nonlinear Mathematical Physics 2011 ;Volum 18. s. 177-187NHH Untitled 20. Kozlov, Roman. On maximal Lie point symmetry groups admitted by scalar stochastic differential equations. Journal of Physics A: Mathematical and Theoretical 2011 ;Volum 44.(20) s. -NHH Untitled 21. Kozlov, Roman; Dorodnitsyn, Vladimir. Lagrangian and Hamiltonian Formalism for Discrete Equations: Symmetries and First Integrals. London Mathematical Society Lecture Notes 2011 ;Volum 381. s. 7-49NHH Untitled 2010 22. Dorodnitsyn, V; Kozlov, Roman. Invariance and first integrals of continuous and discrete Hamiltonian equations. Journal of Engineering Mathematics 2010 ;Volum 66.(1-3) s. 253-270NHH Untitled 23. Dorodnitsyn, Vladimir; Kozlov, Roman. Invariance and first integrals of continuous and discrete Hamiltonian equations. Journal of Engineering Mathematics 2010 ;Volum 66.(1-3) s. 253-270NHH Untitled 24. Kozlov, Roman. Symmetries of systems of stochastic differential equations with diffusion matrices of full rank. Journal of Physics A: Mathematical and Theoretical 2010 ;Volum 43.(24) s. 16- Untitled 25. Kozlov, Roman. Symmetries of systems of stochastic differential equations with diffusion matrices of full rank. Journal of Physics A: Mathematical and Theoretical 2010 ;Volum 43.(24) s. -NHH Untitled 26. Kozlov, Roman. Symmetries of systems of stochastic differential equations with diffusion matrices of full rank. Journal of Physics A: Mathematical and Theoretical 2010 ;Volum 43.(24) s. -NHH Untitled 27. Kozlov, Roman. The group classification of a scalar stochastic differential equation. Journal of Physics A: Mathematical and Theoretical 2010 ;Volum 43.(5) s. -NHH Untitled 28. Kozlov, Roman. The group classification of a scalar stochastic differential equation. Journal of Physics A: Mathematical and Theoretical 2010 ;Volum 43.(5) s. 13- Untitled 2009 29. Dorodnitsyn, Vladimir; Kozlov, Roman. First integrals of difference Hamiltonian equations. Journal of Physics A: Mathematical and Theoretical 2009 ;Volum 42.(45) s. -NHH Untitled 30. Kozlov, Roman. Exponential splitting time integration for pseudospectral methods on moving meshes. Journal of Computational and Applied Mathematics 2009 ;Volum 228.(1) s. 56-69UiB Untitled 2008 31. Kozlov, Roman. Exponential operator splitting time integration for spectral methods. Journal of Computational and Applied Mathematics 2008 ;Volum 222.(2) s. 592-607UiB Untitled 32. Kozlov, Roman. High-order conservative discretizations for some cases of the rigid body motion. Physics Letters A 2008 ;Volum 373.(1) s. 23-29UiB Untitled 2007 33. Kozlov, Roman. A conservative discretization of the Kepler problem based on the L-transformations. Physics Letters A 2007 ;Volum 369.(4) s. 262-273UiB Untitled 34. Kozlov, Roman. Conservative discretizations of the Kepler motion. Journal of Physics A: Mathematical and Theoretical 2007 ;Volum 40.(17) s. 4529-4539UiB Untitled 2005 35. Kozlov, Roman. On conservation properties of semidiscrete canonical Hamiltonian equations. CRM Proceedings and Lecture notes AMS 2005 ;Volum 39. s. 165-177UiB Untitled 36. Kozlov, Roman. On rotationally symmetric solutions of the classical ${\rm SU}(2)$ Yang-Mills fields in $\bold R \sp {2+1}$. Journal of Nonlinear Mathematical Physics 2005 UiO Untitled 2004 37. Kværnø, Anne; Kozlov, Roman; Owren, Brynjulf. The behaviour of the local error in splitting methods applied to stiff problems. Journal of Computational Physics 2004 ;Volum 195.(2) s. 576-593NTNU UiO Untitled 38. Kozlov, Roman; Winternitz, P. Continuous symmetries of Lagrangians and exact solutions of discrete equations. Journal of Mathematical Physics 2004 ;Volum 45. s. 336-359UiO Untitled 2003 39. Kozlov, Roman. A heat transfer with a source: the complete set of invariant difference schemes. Journal of Nonlinear Mathematical Physics 2003 ;Volum 10.(1) s. 16-50UiO Untitled 40. Kozlov, Roman. Symmetries, Lagrangian Formalism and Integration of Second Order Ordinary Difference Equations. Journal of Nonlinear Mathematical Physics 2003 ;Volum 10. Suppl. 2 s. 41-56UiO Untitled