1. Über den jetzigen Stand der Chemotherapie;Ehrlich;Ber. Dtsch. Chem. Ges.,1909
2. Molecular orbital calculation of preferred conformations of acetylcholine, muscarine, and muscarone;Kier;Mol. Pharmacol.,1967
3. MO Theory in Drug Research;Kier,1971
4. Evolution of the pharmacophore concept in pharmaceutical research;Gund,2000
5. Glossary of terms used in medicinal chemistry (IUPAC Recommendations 1997);Wermuth;Annu. Rep. Med. Chem.,1998