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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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15 mar 1956 año - LUDWIN VON BERTALANFFY Teoría general de sistemas
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tiempo 1
By
Matias Ignacio Milla
14 nov 2017
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815
fecha:
15 mar 1956 año
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~ 69 years ago
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