@article{PismaZhETF.18.689,
    title = {Energy spectrum of $He^3$ quasiparticles in $He^3-He^4$ superfluid solutions},
    author = {Sobolev, V. I. and Esel'son, B. N.},
    journal = {πΙΣΨΝΑ Χ φότζ},
    volume = {18},
    issue = {11},
    pages = {689},
    year = {1973},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_26640.shtml},
}