@article{DAN_1974_216_5_a21,
     author = {V. M. Sergeev and V. V. Dergunov and L. F. Gavrikov and O. V. Kononov and G. P. Barsanov},
     title = {On blue colouring of calcite},
     journal = {Doklady Akademii Nauk},
     pages = {1037--1039},
     publisher = {mathdoc},
     volume = {216},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_216_5_a21/}
}