Buckle, L.; Guisado, C.; Tarifeño, E.; Zuleta, A.; Cordova, L.; Serrano, C. Biological Studies On The Chilean Sea-Urchin Loxechinus Albus (Molina) (Echinodermata- Echinoidea) IV.- Maturation Cycle And Seasonal Biochemical Changes In The Gonad. Cienc. Mar. 1978, 5, 1-18.