@article{DAN_1969_186_6_a0,
     author = {A. L. Badoev and B. N. Sadovskii},
     title = {An example of a densifying operator in the theory of differential equations with deviating argument of neutral type},
     journal = {Doklady Akademii Nauk},
     pages = {1239--1242},
     publisher = {mathdoc},
     volume = {186},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_6_a0/}
}