@article{DAN_1969_187_6_a10,
     author = {V. A. Taft and V. Yu. Gorelik},
     title = {On the frequency and time characteristics of systems with varying parameters},
     journal = {Doklady Akademii Nauk},
     pages = {1251--1253},
     publisher = {mathdoc},
     volume = {187},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_6_a10/}
}