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References:
[1] Joseph R. Shoenfield: Mathematical Logic. Addison-Wesley Publ. Comp., Reading, Massachusetts-Menlo Park, California-London-Don Mills, Ontario 1967. MR 0225631
[2] R. Jičín Z. Pilous Z. Vašíček: Grundlagen einer formalen Methode zur Zusammenstellung und Bewertung von Bestimmungsschlüsseln. Preslia 41 (1969), p. 71-85.
[3] R. Hall: A Computer-based System for Forming Identification Keys. Taxon 19 (1970), 1.
[4] D. V. Osborne: New Aspects of the Theory of Dichotomous Keys. New Phytologist (1962).
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