Elementary excitations in quantum fluids
Elementarnye vozbuzhdeniya v kvantovykh zhidkostyakh

Lev P. Pitaevskii
1990 Uspehi fiziceskih nauk  
doi:10.3367/ufnr.0160.199010n.0201 fatcat:i7677lhp4nek3cxmhf5bzreogm