@article{JETPL.99.501, title = {}, author = {Glushkov, A. V. and , and Saburov, A. V.}, journal = {JETP Lett.}, volume = {99}, issue = {8}, pages = {431}, year = {2014}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X14080025}, note = {[Pisma v ZhETF 99, 501 (2014)]} }