Tensorial Euler-Lagrange expressions and conservation laws. Ian M. Anderson — 1978 Aequationes mathematicae
Tensorial Euler-Lagrange expressions and conservation laws. (Short Communication). Ian M. Anderson — 1978 Aequationes mathematicae
Aspects of the inverse problem to the calculus of variations Ian M. Anderson — 1988 Archivum Mathematicum
Variational principles for differential equations with symmetries and conservation laws. I. Second order scalar equations. Ian M. Anderson; Juha Pohjanpelto — 1994 Mathematische Annalen
Variational principles for differential equations with symmetries and conservation laws. II. Polynomial differential equations. Ian M. Anderson; Juha Pohjanpelto — 1995 Mathematische Annalen