A direct approach to finding exact invariants for one‐dimensional time‐dependent classical Hamiltonians HR Lewis, PGL Leach
Journal of Mathematical Physics 23 (12), 2371-2374, 1982
273 1982 Symmetry Lie algebras of nth order ordinary differential equations FM Mahomed, PGL Leach
Journal of Mathematical Analysis and Applications 151 (1), 80-107, 1990
219 1990 Cosmological solutions of A Paliathanasis, JD Barrow, PGL Leach
Physical Review D 94 (2), 023525, 2016
192 2016 First integrals for the modified Emden equation q+ α (t) q+ qn= 0 PGL Leach
Journal of Mathematical Physics 26 (10), 2510-2514, 1985
144 1985 The Ermakov equation: a commentary PGL Leach, K Andriopoulos
Applicable Analysis and Discrete Mathematics, 146-157, 2008
141 2008 Lie algebras associated with scalar second‐order ordinary differential equations FM Mahomed, PGL Leach
Journal of Mathematical Physics 30 (12), 2770-2777, 1989
120 1989 Exact solutions for the Tikekar superdense star SD Maharaj, PGL Leach
Journal of Mathematical Physics 37 (1), 430-437, 1996
103 1996 Invariants and wavefunctions for some time‐dependent harmonic oscillator‐type Hamiltonians PGL Leach
Journal of Mathematical Physics 18 (10), 1902-1907, 1977
99 1977 On the theory of time‐dependent linear canonical transformations as applied to Hamiltonians of the harmonic oscillator type PGL Leach
Journal of Mathematical Physics 18 (8), 1608-1611, 1977
99 1977 The linear symtries of a nonlinear differential equation FM Mahomed, PGL Leach
Quaestiones Mathematicae 8 (3), 241-274, 1985
95 1985 Lagrangians galore MC Nucci, PGL Leach
Journal of mathematical physics 48 (12), 2007
92 2007 Linearisable Third-Order Ordinary Differential Equations and Generalised Sundman Transformations: The Case X ′′′ =0 N Euler, T Wolf, PGL Leach, M Euler
Acta Applicandae Mathematica 76, 89-115, 2003
92 2003 Generalized invariants for the time‐dependent harmonic oscillator NJ Günther, PGL Leach
Journal of Mathematical Physics 18 (4), 572-576, 1977
91 1977 An exact invariant for a class of time‐dependent anharmonic oscillators with cubic anharmonicity PGL Leach
Journal of Mathematical Physics 22 (3), 465-470, 1981
83 1981 Exact invariants for a class of time‐dependent nonlinear Hamiltonian systems HR Lewis, PGL Leach
Journal of Mathematical Physics 23 (1), 165-175, 1982
82 1982 Jacobi’s last multiplier and Lagrangians for multidimensional systems MC Nucci, PGL Leach
Journal of mathematical physics 49 (7), 2008
81 2008 Generalized Ermakov systems PGL Leach
Physics Letters A 158 (3-4), 102-106, 1991
81 1991 Integration of second order ordinary differential equations not possessing Lie point symmetries B Abraham-Shrauner, KS Govinder, PGL Leach
Physics Letters A 203 (4), 169-174, 1995
79 1995 The Painleve test, hidden symmetries and the equation y"+ yy'+ Ky3= 0 RL Lemmer, PGL Leach
Journal of Physics A: Mathematical and General 26 (19), 5017, 1993
78 1993 Harmonic oscillator with variable mass PGL Leach
Journal of Physics A: Mathematical and General 16 (14), 3261, 1983
77 1983 
Andronikos PaliathanasisDurban University of TechnologyDirección de correo verificada de phys.uoa.gr
