Brandon R.; Rocca, Walter A. Premature menopause or early menopause: Long-term health consequences. Maturitas. 2010, 65 (2): 161–166. ISSN 0378-5122. PMC 2815011
Triton. Science. 1993-08, 261 (5122): 751–754. Bibcode:1993Sci...261..751T. PMID 17757214. doi:10.1126/science.261.5122.751. H. B. Niemann; et al. The abundances