Naaz, H; Singh, S; Pandey, VP; Singh, P; Dwivedi, UN (2013). "Anti-cholinergic alkaloids as potential therapeutic agents for Alzheimer's disease: An in silico approach". Indian Journal of Biochemistry & Biophysics. 50 (2): 120–5. PMID23720886.
Wu, Yang-Chang; Duh, Chang-Yih; Wang, Shang-Kwei; Chen, Keh-Shaw; Yang, Tsang-Hsiung (1990-09-01). "Two New Natural Azafluorene Alkaloids and a Cytotoxic Aporphine Alkaloid from Polyalthia longifolia". Journal of Natural Products. 53 (5): 1327–1331. doi:10.1021/np50071a028. ISSN0163-3864. PMID2292689.