@article{SM_2021_212_9_a1,
     author = {Ya. M. Dymarskii and A. A. Bondar'},
     title = {An eigenfunction manifold generated by a~family of periodic boundary value problems},
     journal = {Sbornik. Mathematics},
     pages = {1208--1227},
     publisher = {mathdoc},
     volume = {212},
     number = {9},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2021_212_9_a1/}
}