no. 1
The Foldy-Wouthuysen transformation in the two-particle case
Annales de l'I.H.P. Physique théorique, Tome 47 (1987) no. 1, pp. 39-62. 
@article{AIHPA_1987__47_1_39_0,
     author = {Sazdjian, H.},
     title = {The {Foldy-Wouthuysen} transformation in the two-particle case},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {39--62},
     publisher = {Gauthier-Villars},
     volume = {47},
     number = {1},
     year = {1987},
     mrnumber = {912756},
     zbl = {0628.46074},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1987__47_1_39_0/}
}
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Sazdjian, H. The Foldy-Wouthuysen transformation in the two-particle case. Annales de l'I.H.P. Physique théorique, Tome 47 (1987) no. 1, pp. 39-62. http://www.numdam.org/item/AIHPA_1987__47_1_39_0/

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