Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1979_4_a1, author = {V. K. Karpasyuk}, title = {A~family of {Hill} equations with common characteristic exponents}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {14--16}, publisher = {mathdoc}, number = {4}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1979_4_a1/} }
V. K. Karpasyuk. A~family of Hill equations with common characteristic exponents. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1979), pp. 14-16. http://geodesic.mathdoc.fr/item/IVM_1979_4_a1/