@article{1183493820, author = {Tamarkin, J. D.}, title = {A lemma of the theory of linear differential systems}, journal = {Bull. Amer. Math. Soc.}, volume = {36}, number = {11}, year = {1930}, pages = { 99-102}, language = {en}, url = {http://dml.mathdoc.fr/item/1183493820} }
Tamarkin, J. D. A lemma of the theory of linear differential systems. Bull. Amer. Math. Soc., Tome 36 (1930) no. 11, pp. 99-102. http://gdmltest.u-ga.fr/item/1183493820/