Composition of quaternary quadratic forms
Compositio Mathematica, Tome 60 (1986) no. 2, pp. 133-150. 
@article{CM_1986__60_2_133_0,
     author = {Kneser, M. and Knus, M.-A. and Ojanguren, M. and Parimala, R. and Sridharan, R.},
     title = {Composition of quaternary quadratic forms},
     journal = {Compositio Mathematica},
     pages = {133--150},
     publisher = {Martinus Nijhoff Publishers},
     volume = {60},
     number = {2},
     year = {1986},
     mrnumber = {868134},
     zbl = {0612.10015},
     language = {en},
     url = {http://www.numdam.org/item/CM_1986__60_2_133_0/}
}
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Kneser, M.; Knus, M.-A.; Ojanguren, M.; Parimala, R.; Sridharan, R. Composition of quaternary quadratic forms. Compositio Mathematica, Tome 60 (1986) no. 2, pp. 133-150. http://www.numdam.org/item/CM_1986__60_2_133_0/

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