@article{JETPL.109.481, title = {}, author = {Artyukh, A. A. and Chernozatonskii, L. A.}, journal = {JETP Lett.}, volume = {109}, issue = {7}, pages = {472}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19070099}, note = {[Pisma v ZhETF 109, 481 (2019)]} }