The position operator revisited
Annales de l'I.H.P. Physique théorique, Tome 49 (1988) no. 2, pp. 245-255. 
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     author = {Bacry, H.},
     title = {The position operator revisited},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {245--255},
     publisher = {Gauthier-Villars},
     volume = {49},
     number = {2},
     year = {1988},
     mrnumber = {984151},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1988__49_2_245_0/}
}
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Bacry, H. The position operator revisited. Annales de l'I.H.P. Physique théorique, Tome 49 (1988) no. 2, pp. 245-255. http://archive.numdam.org/item/AIHPA_1988__49_2_245_0/

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[4] E. Schrödinger, Collected Papers, Vol. III, p. 394-435 (Friedr. Wieweg, Wien, 1984).

[5] E.P. Wigner, Ann. Math., t. 40, 1939, p. 149. | JFM | Zbl

[6] A.S. Wightman, Rev. Mod. Phys., t. 34, 1962, p. 845. | MR

[9] H. Bacry, Nuovo Cimento, t. 32 A, 1976, p. 448.

[10] R.P. Feynman, Lecture Notes in Physics, Vol. III, Chapter 1 (Addison-Wesley, 1966).