Hardwick, J.C., Kotarski, A.F. ('04), and Powers M.J ('01). (2006) and Ionic mechanisms of histamine-induced responses in guinea pig intracardiac neurons. American Journal of Physiology, 290: R241-R250.
View the abstract here:
https://www.ithaca.edu/biology/article_hardwicketal05.pdf
https://www.ithaca.edu/intercom/article.php/20060118093430119