@article{DAN_1974_216_2_a19,
     author = {Yu. P. Bulashevich},
     title = {Secular variations of geomagnetic field and the classification of magnetic anomalies},
     journal = {Doklady Akademii Nauk},
     pages = {313--315},
     publisher = {mathdoc},
     volume = {216},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_216_2_a19/}
}