Verspohl EJ, Tacke R, Mutschler E, Lambrecht G. Muscarinic receptor subtypes in rat pancreatic islets: binding and functional studies. Eur. J. Pharmacol.. 1990, roč. 178, čís. 3, s. 303–11. doi:10.1016/0014-2999(90)90109-J. PMID2187704.
Verspohl EJ, Tacke R, Mutschler E, Lambrecht G. Muscarinic receptor subtypes in rat pancreatic islets: binding and functional studies. Eur. J. Pharmacol.. 1990, roč. 178, čís. 3, s. 303–11. doi:10.1016/0014-2999(90)90109-J. PMID2187704.