The region of Praesepe - Luyten, Willem Jacob, 1899-1994; Luyten, Willem Jacob, 1899-1994.; Luyten, Willem Jacob, 1899-1994.; Miller, Freeman D. (Minneapolis, Minnesota : The Observatory of Minnesota, 1960)
Keywords: astronomická pozorování; astronomie; bílí trpaslíci; galaxie; hvězdy; astronomical observations; astronomy; galaxies; stars; white dwarf stars; odborné časopisy; professional journals