1. The lattice theory of information;Shannon;Trans. IRE Prof. Group Inf. Theory,1953
2. Life, information theory, and topology;Rashevsky;Bull. Math. Biophys.,1955
3. A note on the information content of graphs;Trucco;Bull. Math. Biophys.,1956
4. Entropy and the complexity of graphs;Mowshowitz,1967
5. Coding of an information source having ambiguous alphabet and the entropy of graphs;Körner,1973