From Jonbinspain:
Physiological significance of nitrergic transmission in human penile erection. - PubMed - NCBI (http://www.ncbi.nlm.nih.gov/pubmed/11228938)
Other files of interest from the same page:
Physiological regulation of penile arteries and veins. - PubMed - NCBI (http://www.ncbi.nlm.nih.gov/pubmed/17637789)
Regulation of pre-synaptic alpha adrenergic activity in the corpus cavernosum. - PubMed - NCBI (http://www.ncbi.nlm.nih.gov/pubmed/10845761)
Erectile dysfunction: from biochemical pharmacology to advances in medical therapy. - PubMed - NCBI (http://www.ncbi.nlm.nih.gov/pubmed/10913932)
Neurotransmission and the contraction and relaxation of penile erectile tissues. - PubMed - NCBI (http://www.ncbi.nlm.nih.gov/pubmed/9066089)
James