@article{JETPL.109.689, title = {}, author = {Norman, G. E. and , and Fleita, D. I.}, journal = {JETP Lett.}, volume = {109}, issue = {10}, pages = {667}, year = {2019}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.1134/S0370274X19100096}, note = {[Pisma v ZhETF 109, 689 (2019)]} }