The definite quadratic forms in eight variables with determinant unity
Journal de Mathématiques Pures et Appliquées, Série 9, Jubilé de M. Jacques Hadamard, Tome 17 (1938) no. 1-4, pp. 41-46. 
@article{JMPA_1938_9_17_1-4_41_0,
     author = {Mordell, L.-J.},
     title = {The definite quadratic forms in eight variables with determinant unity},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {41--46},
     publisher = {Gauthier-Villars},
     volume = {Ser. 9, 17},
     number = {1-4},
     year = {1938},
     zbl = {0018.29401},
     language = {en},
     url = {http://www.numdam.org/item/JMPA_1938_9_17_1-4_41_0/}
}
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Mordell, L.-J. The definite quadratic forms in eight variables with determinant unity. Journal de Mathématiques Pures et Appliquées, Série 9, Jubilé de M. Jacques Hadamard, Tome 17 (1938) no. 1-4, pp. 41-46. http://www.numdam.org/item/JMPA_1938_9_17_1-4_41_0/