Nucleotide sequences of 18S ribosomal RNA genes from the red algae Gracilaria tikvahiae McLachlan, Gracilaria verrucosa (Hudson) Papenfuss and Gracilariopsis sp. - Carolyn J. Bird; Ellen L. Rice; Colleen A. Murphy; Qing Yan Liu; Mark A. Ragan (Nucleic Acids Res., 1990)