SOME PROPERTIES OF GENERALIZED MANIFOLDS Article ZERKALOV L.G. Russian Mathematical Surveys. Vol. 39. 1984. P. 215-216
CHEMICAL AND MINERAL-COMPOSITION OF THE FINELY DISPERSED COMPONENT AND MICROSTRUCTURE OF SOME SOILS IN SUDAN Article ELTEZHANI M.S., GRADUSOV B.P., RUBILINA N.Y., CHIZHIKOVA N.P. Soviet Soil Science. Vol. 16. 1984. P. 75-81