Rao A. Regionalization of watersheds : an approach based on cluster analysis / A. Rao, V. Srinivas, 2008 r=on-line. - Текст : электронный.
Barbieri-Viale L. Albanese and picard 1-motives / L.Barbieri-Viale,V.Srinivas, 2001. - 104 p. - Текст : непосредственный.