no. 1
C * -algebraic generalization of relative entropy and entropy
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 37 (1982) no. 1, pp. 51-58 
@article{AIHPA_1982__37_1_51_0,
     author = {Belavkin, V. P. and Staszewski, P.},
     title = {$C^\ast $-algebraic generalization of relative entropy and entropy},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {51--58},
     year = {1982},
     publisher = {Gauthier-Villars},
     volume = {37},
     number = {1},
     mrnumber = {667882},
     zbl = {0526.46060},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1982__37_1_51_0/}
}
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Belavkin, V. P.; Staszewski, P. $C^\ast $-algebraic generalization of relative entropy and entropy. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 37 (1982) no. 1, pp. 51-58. https://www.numdam.org/item/AIHPA_1982__37_1_51_0/

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