@article{RM_1991_46_2_a0,
     author = {A. N. Andrianov},
     title = {Composition of solutions of quadratic {Diophantine} equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1--44},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1991_46_2_a0/}
}