Reference

Goro Kokubugata, Katsuhiko Kondo (1998): Comparative karyotype analysis of Ceratozamia mexicana and Microcycas calocoma (Zamiaceae) using fluorochrome banding (CMA/DAPI) and fluorescence in situ hybridization of ribosomal DNA – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 210: 41 - 50.