@article{UZERU_2011_3_a2,
     author = {H. S. Harutyunyan},
     title = {Chord length distribution function for lens},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {17--22},
     publisher = {mathdoc},
     number = {3},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2011_3_a2/}
}