Effects of procaine and caffeine on calcium release from the sarcoplasmic reticulum in frog skeletal muscle Klein, M.G.; Simon, B.J.; Schneider, M.F. Journal of Physiology 453: 341-366 1992 0022-3751 10.1113/jphysiol.1992.sp019232 https://eurekamag.com/research/007/282/007282724.php