@article{DAN_1973_210_6_a20,
     author = {K. K. Zapol'skii},
     title = {Frequency-time fields and dynamic characteristics of seismic focus functions of strong earthquakes},
     journal = {Doklady Akademii Nauk},
     pages = {1338--1341},
     publisher = {mathdoc},
     volume = {210},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_210_6_a20/}
}