NASR H. EL-HAMMAMY, AIDA I. KAWANA, and MOUSTAFA M. EL-KHOLY, “Comparative Study on Conductance Measurements At 25oC of Ionic Association of Acetylcholine and S-Acetylthiocholine Bromides in Aqueous and Non-Aqueous Solvents”, ijpbs, vol. 1, no. 2, pp. 1–5, Jun. 2010.