Geodesic
A counterexample to the Hasse principle for a system of two quadratic forms in five variables
Matematičeskie zametki, Tome 10 (1971) no. 3, pp. 253-257 Cet article a éte moissonné depuis la source Math-Net.Ru

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A system of two quadratic forms in five variables with integer coefficients is constructed, which is equal to zero in the field of real numbers and in all $p$-adic fields, but is not zero in the field of rationals. 
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     author = {V. A. Iskovskikh},
     title = {A counterexample to the {Hasse} principle for a system of two quadratic forms in five variables},
     journal = {Matemati\v{c}eskie zametki},
     pages = {253--257},
     year = {1971},
     volume = {10},
     number = {3},
     language = {ru},
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}
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V. A. Iskovskikh. A counterexample to the Hasse principle for a system of two quadratic forms in five variables. Matematičeskie zametki, Tome 10 (1971) no. 3, pp. 253-257. http://geodesic.mathdoc.fr/item/MZM_1971_10_3_a1/