On infinite-dimensional Lagrangian systems with nonpotential forces

Kartashkin V.A., Abashidze A.Kh.

Zaytsev V.P., Zubkov F.I., Toze F.A.A., Orlova D.N., Eliseeva M.N., Grudinin D.G., Nikitina E.V., Varlamov A.V.