@article{JETPL.108.781, title = {}, author = {Shpatakovskaya, G. V.}, journal = {JETP Lett.}, volume = {108}, issue = {11}, pages = {768}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18230091}, note = {[Pisma v ZhETF 108, 781 (2018)]} }