@article{DAN_1990_312_6_a13,
     author = {M. S. Zhdanov and L. M. Abramova and I. M. Varentsov and A. A. Velev and N. G. Golubev and Kh. I. Dachev and S. I. Sanin and V. S. Shneer},
     title = {Deep electromagnetic sounding in {Bulgaria}},
     journal = {Doklady Akademii Nauk},
     pages = {1338--1343},
     publisher = {mathdoc},
     volume = {312},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_312_6_a13/}
}