no. 2
Hidden variables and 2-dimensional Hilbert space
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 16 (1972) no. 2, pp. 93-102 
@article{AIHPA_1972__16_2_93_0,
     author = {Bugajska, Krystyna and Bugajski, Slawomir},
     title = {Hidden variables and 2-dimensional {Hilbert} space},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {93--102},
     year = {1972},
     publisher = {Gauthier-Villars},
     volume = {16},
     number = {2},
     mrnumber = {389062},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1972__16_2_93_0/}
}
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Bugajska, Krystyna; Bugajski, Slawomir. Hidden variables and 2-dimensional Hilbert space. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 16 (1972) no. 2, pp. 93-102. https://www.numdam.org/item/AIHPA_1972__16_2_93_0/

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