@article{DE_1989_25_11_a7,
     author = {\`E. Kadelburg and M. Martinovi\v{c}},
     title = {The spectral function of a second-order functional-differential operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1882--1888},
     year = {1989},
     volume = {25},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_11_a7/}
}