Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1986_40_4_a6, author = {V. L. Kulik}, title = {Regularity of systems of linear differential equations of block-triangle form}, journal = {Matemati\v{c}eskie zametki}, pages = {484--491}, publisher = {mathdoc}, volume = {40}, number = {4}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1986_40_4_a6/} }
V. L. Kulik. Regularity of systems of linear differential equations of block-triangle form. Matematičeskie zametki, Tome 40 (1986) no. 4, pp. 484-491. http://geodesic.mathdoc.fr/item/MZM_1986_40_4_a6/