@article{JETPL.109.605, title = {}, author = {Sadovnikov, S. I. and Gusev, A. I.}, journal = {JETP Lett.}, volume = {109}, issue = {9}, pages = {584}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19090078}, note = {[Pisma v ZhETF 109, 605 (2019)]} }