@article{UZERU_2003_3_a3,
     author = {E. A. Simonyan},
     title = {An extension of the {Little's} formula},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {25--29},
     year = {2003},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2003_3_a3/}
}