(en) Detlev Blanke, « How not to Reinvent the Wheel... The Essential Scholarly Litterature in Interlinguistics and Esperantology », Interdisciplinary Description of Complex Systems - Scientific Journal, , p. 200-215 (ISSN1334-4684)
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Hans Freudenthal, Design of a Language for Cosmic Intercourse, North-Holland, Amsterdam, 1960. Voir (en) Marvin Minsky pour les principes.