BARANOV, D.; YARUNIN, V. Phonons and rotons of trapped atoms in gravitational field. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 29, n. 6, p. 674–677, 2003. DOI: 10.1063/1.1542538. Disponível em: https://fnt.ilt.kharkiv.ua/index.php/fnt/article/view/f29-0674e. Acesso em: 2 трав. 2024.