Geodesic
Extreme quadratic forms of a special type in $n$ variables $(n\leq 28)$.
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 6, Tome 144 (1985), pp. 167-172

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One constructs perfect, extreme positive-definite quadratic forms of a special form in $n$ variables for $n\leq28$, whose frames give the simplest packings of the space $\mathbb{R}^n$. 
@article{ZNSL_1985_144_a16,
     author = {A. Hurramov},
     title = {Extreme quadratic forms of a special type in $n$ variables $(n\leq 28)$.},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {167--172},
     publisher = {mathdoc},
     volume = {144},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_144_a16/}
}
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A. Hurramov. Extreme quadratic forms of a special type in $n$ variables $(n\leq 28)$.. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 6, Tome 144 (1985), pp. 167-172. http://geodesic.mathdoc.fr/item/ZNSL_1985_144_a16/