@article{JETPL.110.421, title = {}, author = {Yasnikov, I. S. and , and , and , }, journal = {JETP Lett.}, volume = {110}, issue = {6}, pages = {436}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19180139}, note = {[Pisma v ZhETF 110, 421 (2019)]} }