no. 2
A mixed theory of information. I : symmetric, recursive and measurable entropies of randomized systems of events
RAIRO. Informatique théorique, Tome 12 (1978) no. 2, pp. 149-155. 
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     author = {Acz\'el, J. and Dar\'oczy, Z.},
     title = {A mixed theory of information. {I} : symmetric, recursive and measurable entropies of randomized systems of events},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {149--155},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {2},
     year = {1978},
     mrnumber = {490441},
     zbl = {0382.94012},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1978__12_2_149_0/}
}
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Aczél, J.; Daróczy, Z. A mixed theory of information. I : symmetric, recursive and measurable entropies of randomized systems of events. RAIRO. Informatique théorique, Tome 12 (1978) no. 2, pp. 149-155. http://archive.numdam.org/item/ITA_1978__12_2_149_0/

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