Comparison of fecal preservation and extraction methods for steroid hormone metabolite analysis in wild crested macaques - Gholib Gholib; Michael Heistermann; Muhammad Agil; Iman Supriatna; Bambang Purwantara; Taufiq Purna Nugraha; Antje Engelhardt (Primates, 2018)

Validation of a field-friendly extraction and storage method to monitor fecal steroid metabolites in wild orangutans - Taufiq Purna Nugraha; Michael Heistermann; Muhammad Agil; Bambang Purwantara; Iman Supriatna; Gholib Gholib; Carel P. van Schaik; Tony Weingrill (Primates, 2017)