@article{JETPL.105.624, title = {}, author = {Degtyarenko, N. N. and Mazur, E. A. and Grishakov, K. S.}, journal = {JETP Lett.}, volume = {105}, issue = {10}, pages = {664}, year = {2017}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X17100101}, note = {[Pisma v ZhETF 105, 624 (2017)]} }