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Haiko Sprott; Laurence A. Bradley; Shin J. Oh; Winfried Wintersberger; Graciela S. Alarcón; Holly G. Mussell; Anna Tseng; Renate E. Gay; Steffen Gay. (1998). Immunohistochemical and molecular studies of serotonin, substance P, galanin, pituitary adenylyl cyclase-activating polypeptide, and secretoneurin in fibromyalgic muscle tissue. , 41(9), 1689–1694. doi:10.1002/1529-0131(199809)41:9<1689::aid-art21>3.0.co;2-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research