@article{DAN_1975_224_3_a18,
     author = {N. V. Belkin and A. P. Grumbkov and V. I. Kolesov and N. S. Guseva and V. A. Tsukerman and V. A. Tsygankov},
     title = {Measurement of rock density in wells by means of gamma-quantum generator},
     journal = {Doklady Akademii Nauk},
     pages = {569--572},
     publisher = {mathdoc},
     volume = {224},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_224_3_a18/}
}