Kobori, Y., K. Suzuki, T. Iwahata, T. Shin, Y. Sadaoka, R. Sato, K. Nishio, H. Yagi, G. Arai, S. Soh, H. Okada, J. M. Strong, and P. Rohdewald. “Improvement of Seminal Quality and Sexual Function of Men With Oligoasthenoteratozoospermia Syndrome Following Supplementation With L-Arginine and Pycnogenol®”. Archivio Italiano Di Urologia E Andrologia, vol. 87, no. 3, Sept. 2015, pp. 190-3, doi:10.4081/aiua.2015.3.190.