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@article{DAN_1962_142_1_a7, author = {L. M. Kuks}, title = {Sturm's theorem and the oscillation of solutions of strongly elliptic systems}, journal = {Doklady Akademii Nauk}, pages = {32--35}, publisher = {mathdoc}, volume = {142}, number = {1}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_142_1_a7/} }
L. M. Kuks. Sturm's theorem and the oscillation of solutions of strongly elliptic systems. Doklady Akademii Nauk, Tome 142 (1962) no. 1, pp. 32-35. http://geodesic.mathdoc.fr/item/DAN_1962_142_1_a7/