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1. R. Carlson, A. Nordahl:§Exploring Organic Synthetic Experimental Procedures§2. S.J. Cyvin, B.N. Cyvin, J. Brunvoll:§Enumeration of Benzenoid Chemical Isomers with a Study§of Constant-Isomer Series§3. E.Hladka, J. Koca, M. Kratochvil, V. Kvasnicka, L.§Matyska, J. Pospichal, V. Potucek:§The Synthon Model and the Program PEGAS for Computer§AssistedOrganic Synthesis§4. K. Bley, B. Gruber, M. Knauer, N. Stein, I. Ugi:§New Elements in the Representation of the Logical§Structure of Chemistry byQualitative Mathematical Models§and Corresponding Data Structures