1. Information storage and retrieval: tools, elements, theories;Becker,1963
2. Lattice Theory;Birkhoff,1948
3. Combinatory Logic;Curry,1958
4. A mathematical theory of the use of language symbols in retrieval;Mooers,1958
5. D. Soergel: Some remarks on information languages, their analysis and comparison. Paper read at the Int. Symp. on Relational Factors in Classification, Univ. of Maryland, 1966. To be published in the Proceedings (Pergamon Press).—1.01 ; 1.13; 1.16 : A2.5; 1.16 : A3.5; 1.164 : A4.2.