@article{JETPL.98.231, title = {}, author = {Kuzmin, V. L.}, journal = {JETP Lett.}, volume = {98}, issue = {4}, pages = {204}, year = {2013}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13160042}, note = {[Pisma v ZhETF 98, 231 (2013)]} }