"2007"^^ . "Khan (2007)" . . "Khan, S. A. 2007. New delimitations and phylogenetic relationships of Sabiceeae (Ixoroideae, Rubiaceae) and revision of the Neotropical species of Sabicea Aubl. PhD. (Naturwissenschaften). Universit\u00E4t Bayreuth, Bayreuth. 351 pp." . . "2007"^^ . . "Khan (2007)" .