Reducibility theorems for differentiable liftings in fiber bundles Demeter Krupka — 1979 Archivum Mathematicum
A remark on algebraic identities for the covariant derivative of the curvature tensor Demeter Krupka — 1980 Archivum Mathematicum
On a class of variational problems defined by polynomial Lagrangians Demeter Krupka — 1976 Archivum Mathematicum
A map associated to the Lepagian forms on the calculus of variations in fibred manifolds Demeter Krupka — 1977 Czechoslovak Mathematical Journal
Fundamental vector fields on type fibres of jet prolongations of tensor bundles Demeter Krupka — 1979 Mathematica Slovaca
Pohybové integrály v mechanice vyššího řádu a v teorii polí Demeter Krupka; Jana Musilová — 1983 Pokroky matematiky, fyziky a astronomie
The hamiltonian formalism in higher order variational problems Mauro Francaviglia; Demeter Krupka — 1982 Annales de l'I.H.P. Physique théorique
Hamilton extremals in higher order mechanics Demeter Krupka; Jana Musilová — 1984 Archivum Mathematicum
On the uniqueness of some differential invariants: d , [ , ] , ∇ Demeter Krupka; Věra Mikolášová — 1984 Czechoslovak Mathematical Journal
3rd order differential invariants of coframes Dao Qui Chao; Demeter Krupka — 1999 Mathematica Slovaca
The inverse problem of the calculus of variations for Finsler structures Demeter Krupka; Abdurasoul Èzbekhovich Sattarov — 1985 Mathematica Slovaca
Geometry of Lagrangean structures. 3 Krupka, Demeter — 1987 Proceedings of the 14th Winter School on Abstract Analysis