@article{DAN_1964_156_4_a26,
     author = {N. M. Karavaev and R. A. Vener and K. I. Koroleva},
     title = {Composition and chemical nature of sapropelic acids},
     journal = {Doklady Akademii Nauk},
     pages = {877--879},
     publisher = {mathdoc},
     volume = {156},
     number = {4},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_156_4_a26/}
}