@article{JETPL.107.3, title = {}, author = {Voronin, V. V. and , and Shapiro, D. D.}, journal = {JETP Lett.}, volume = {107}, issue = {1}, pages = {1}, year = {2018}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X18010010}, note = {[Pisma v ZhETF 107, 3 (2018)]} }