González González C, Alonso Lazo J, Costa Alvarenga A y Arruda Sampaio R 2018:  
Fitólitos en clones y variedades de Cenchrus purpureu. 
 Livestock Research for Rural Development. Volume 30, Article #185. 
 Retrieved 
, from http://www.lrrd.org/lrrd30/11/jalon30185.html