BioStor
 | THE MORPHOLOGY OF THE MADREPORARIA, VI THE FOSSULA IN RUGOSE CORALS J E Duerden (1905) Biol Bull 9: 27-52 |
 | Synopsis of the Genera and Suprageneric Taxa of Euphorbiaceae Grady L Webster (1994) Annals of the Missouri Botanical Garden 81: 33-144 |