ISBN 9785918520826 books & textbook
Geometriya bilyardnyh traektoriy v mnogougolnikah
Kravtsov V.M., Kalakova G.K. Geometriya bilyardnykh traektoriy v mnogougolnikakh.
Evraziya. /2013T Hardcover / 304 Pages
isbn-10: 5918520821 / isbn-13: 9785918520826
