@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},
     year = {1979},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1979_4_a1/}
}