no. 2
Multiple discontinuities for 2-to-4 processes
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 26 (1977) no. 2, pp. 193-212 
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     author = {Cahill, K\'evin and Stapp, Henry P.},
     title = {Multiple discontinuities for 2-to-4 processes},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {193--212},
     year = {1977},
     publisher = {Gauthier-Villars},
     volume = {26},
     number = {2},
     mrnumber = {462280},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1977__26_2_193_0/}
}
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Cahill, Kévin; Stapp, Henry P. Multiple discontinuities for 2-to-4 processes. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 26 (1977) no. 2, pp. 193-212. https://www.numdam.org/item/AIHPA_1977__26_2_193_0/

[1] H.P. Stapp, in Structural Analysis of Collision Amplitudes (Les Houches, 1975, ed. D. Iagolnitzer, North-Holland, Amsterdam, 1976), p. 191. | MR

[2] A. White, ibid., p. 427.

[3] J. Coster and H.P. Stapp, J. Math. Phys., 16, 1288 (1975). | MR

[4] K. Cahill and H.P. Stapp, Ann. Phys. (N. Y.), t. 90, 438 (1975). | MR

[5] K. Cahill, Lett. Nuovo Cimento, 10, 577 (1974).

[6] K. Cahill, ref. [1], p. 137.

[7] J. Coster and H.P. Stapp, J. Math. Phys., 11, 2743 (1970). | MR

[8] J. Coster and H.P. Stapp, J. Math. Phys., 11, 1441 (1970). | MR