Velayos Rodríguez, Mauricio, Santos Cirujano, and Pablo García Murillo. “Rielletea helicophyllae a new phytosoc¡ological class of aquatie plants”. Botanica Complutensis, vol. 18, vol. 18, 1993, p. 203, https://revistas.ucm.es/index.php/BOCM/article/view/BOCM9393110203A.