@article{DAN_1976_230_6_a15,
     author = {S. D. Kogan},
     title = {Experimental hodograph of $P$ wave and the horizontal inhomogeneity of the mantle},
     journal = {Doklady Akademii Nauk},
     pages = {1318--1321},
     publisher = {mathdoc},
     volume = {230},
     number = {6},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_6_a15/}
}