References
- Alm , P. , Alumets , J. , Hakanson , R. , Helm , G. , Owman , C. , Sjoberg , N.O. and Sundler , F. 1980 . Vasoactive intestinal polypeptide nerves in the human female genital tract . American Journal of Obstetrics and Gynecology , 136 : 349 – 351 .