"Faint objects." . . "Radiant flux density." . . . . . . . . . . . . . . . . . . . . . . . . . . . . "On the existence of low-luminosity cataclysmic variables beyond the orbital period minimum"@en . . . "Cataclysmic variables." . . "Brown dwarf stars." . . "Galaxies." . . "Luminosity." . . "Incandescence." . . . . "Stars." . . "Mass transfer." . . "Star clusters." . .