Reference
Gianni Sacchetti, Carlo Romagnoli, Alessandro Bruni, Ferruccio Poli (2001): Secretory Tissue Ultrastructure in Tagetes patula L. (Asteraceae) and Thiophene Localization through X-Ray Microanalysis. – Phyton, Annales Rei Botanicae, Horn – 41_1: 35 - 47.