1. Alves R. J. V. (1990): Methods of floral analysis in the BrazilianOrchidaceae.—Preslia, Praha, 62: 351–357.
2. Alves R. J. V. (1991):Liparis beckeri andPelexia phallocallosa—two new species of BrazilianOrchidaceae. —Folia Geobot. Phytotax., Praha, 26: 171–179.
3. Hoehne F. C. (1945): Flora Brasilica.—Vol. XII, II, p. 264–265, tab. 139, Secr. Agr. Ind. Com., Sao Paulo [diagnosis ofStenorrhynchus esmeraldae (Lind. etRchb. f.)Cogn.]
4. Pabst G. F. J. etDungs F. (1975):Orchidaceae brasilienses.—Vol. 1, p. 111, 129, 182, 283, 404, Brücke-Verlag, Hildesheim, W. Germany.