no. 2
Group law on the intersection of two quadrics
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 7 (1980) no. 2, pp. 217-239 
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     author = {Donagi, Ron},
     title = {Group law on the intersection of two quadrics},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {217--239},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 7},
     number = {2},
     year = {1980},
     mrnumber = {581142},
     zbl = {0457.14023},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1980_4_7_2_217_0/}
}
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Donagi, Ron. Group law on the intersection of two quadrics. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 4, Volume 7 (1980) no. 2, pp. 217-239. https://www.numdam.org/item/ASNSP_1980_4_7_2_217_0/

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