@article{DAN_1988_298_3_a15,
     author = {A. A. Berdyev and V. A. Mukhamedov},
     title = {On the observation of seismic wave velocity variations with
},
     journal = {Doklady Akademii Nauk},
     pages = {578--581},
     publisher = {mathdoc},
     volume = {298},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_298_3_a15/}
}