Endothelium-derived nitric oxide relaxes nonvascular smooth muscle
European Journal of Pharmacology (1989) - Comments
pubmed: 2542037  issn: 0014-2999  doi: 10.1016/0014-2999(89)90180-5 

Georgette M. Buga, Michele E. Gold, Keith S. Wood, Gautam Chaudhuri, Louis J. Ignarro