@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/