@article{JETPL.108.196, title = {}, author = {Martynov, S. N.}, journal = {JETP Lett.}, volume = {108}, issue = {3}, pages = {196}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X18150092}, note = {[Pisma v ZhETF 108, 196 (2018)]} }