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The diophantine equation (x2 - 1) (y2 - 1) = (z2 - 1)2: a footnote.
Elemente der Mathematik, Tome 42 (1987) no. 4, p. 109 Cet article a éte moissonné depuis la source European Digital Mathematics Library

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@article{ELMA_1987__42_4_141409,
     author = {Shoichi Hirose},
     title = {The diophantine equation (x2 - 1) (y2 - 1) =  (z2 - 1)2: a footnote.},
     journal = {Elemente der Mathematik},
     pages = {109--109},
     year = {1987},
     volume = {42},
     number = {4},
     zbl = {0699.10027},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141409/}
}
TY  - JOUR
AU  - Shoichi Hirose
TI  - The diophantine equation (x2 - 1) (y2 - 1) =  (z2 - 1)2: a footnote.
JO  - Elemente der Mathematik
PY  - 1987
SP  - 109
EP  - 109
VL  - 42
IS  - 4
UR  - http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141409/
ID  - ELMA_1987__42_4_141409
ER  - 
%0 Journal Article
%A Shoichi Hirose
%T The diophantine equation (x2 - 1) (y2 - 1) =  (z2 - 1)2: a footnote.
%J Elemente der Mathematik
%D 1987
%P 109-109
%V 42
%N 4
%U http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141409/
%F ELMA_1987__42_4_141409
Shoichi Hirose. The diophantine equation (x2 - 1) (y2 - 1) =  (z2 - 1)2: a footnote.. Elemente der Mathematik, Tome 42 (1987) no. 4, p. 109. http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141409/