@article{1183499462, author = {Copeland, A. H.}, title = {A mixture theorem for nonconservative mechanical systems}, journal = {Bull. Amer. Math. Soc.}, volume = {42}, number = {12}, year = {1936}, pages = { 895-900}, language = {en}, url = {http://dml.mathdoc.fr/item/1183499462} }
Copeland, A. H. A mixture theorem for nonconservative mechanical systems. Bull. Amer. Math. Soc., Tome 42 (1936) no. 12, pp. 895-900. http://gdmltest.u-ga.fr/item/1183499462/