Biquaternion algebras and quartic extensions
Publications Mathématiques de l'IHÉS, Tome 77 (1993), pp. 63-102. 
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     author = {Lam, Tsit Yuen and Leep, David B. and Tignol, Jean-Pierre},
     title = {Biquaternion algebras and quartic extensions},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {63--102},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {77},
     year = {1993},
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     zbl = {0801.11048},
     language = {en},
     url = {http://www.numdam.org/item/PMIHES_1993__77__63_0/}
}
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Lam, Tsit Yuen; Leep, David B.; Tignol, Jean-Pierre. Biquaternion algebras and quartic extensions. Publications Mathématiques de l'IHÉS, Tome 77 (1993), pp. 63-102. http://www.numdam.org/item/PMIHES_1993__77__63_0/

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