@article{PismaZhETF.25.132, title = {New Lorentz-invariant system with exact multisoliton solutions}, author = {Getmanov, B. S.}, journal = {πΙΣΨΝΑ Χ φότζ}, volume = {25}, issue = {2}, pages = {132}, year = {1977}, doi = {}, url = {http://jetpletters.ru/ps/0/article_21090.shtml}, }