Geodesic
On the theory of the reduction of positive quadratic forms. Abnormality of the partition of the positivity cone into the Minkowski $(n\geqslant7)$ and Barns--Cohn reduction regions $(n=4)$.
Zapiski Nauchnykh Seminarov POMI, Studies in number theory. Part 9, Tome 151 (1986), pp. 125-134

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     author = {P. P. Tammela},
     title = {On the theory of the reduction of positive quadratic forms. {Abnormality} of the partition of the positivity cone into the {Minkowski} $(n\geqslant7)$ and {Barns--Cohn} reduction regions $(n=4)$.},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {125--134},
     publisher = {mathdoc},
     volume = {151},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1986_151_a12/}
}
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P. P. Tammela. On the theory of the reduction of positive quadratic forms. Abnormality of the partition of the positivity cone into the Minkowski $(n\geqslant7)$ and Barns--Cohn reduction regions $(n=4)$.. Zapiski Nauchnykh Seminarov POMI, Studies in number theory. Part 9, Tome 151 (1986), pp. 125-134. http://geodesic.mathdoc.fr/item/ZNSL_1986_151_a12/