@article{PismaZhETF.98.853,
    title = {Tkachenko waves\\{\sl In memory of V.K.\,Tkachenko}},
    author = {Sonin, E. B.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {98},
    issue = {11},
    pages = {853},
    year = {2013},
    doi = {10.7868/S0370274X13230215},
    url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X13230215},
}