@article{CHEB_2013_14_2_a12,
     author = {U. M. Pachev},
     title = {On the distribution of reduced indefinite binary quadratic forms with the condition of first coefficients divisibility in residue classes},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {139--150},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2013_14_2_a12/}
}