T. R. Billiar, G. Cirino, D. Fulton, R. Motterlini, A. Papapetropoulos, and C. Szabo, “Nitric oxide synthases (version 2019.4) in the IUPHAR/BPS Guide to Pharmacology Database”, GtoPdb CITE, vol. 2019, no. 4, Sep. 2019.