Odd unimodular lattices
Zapiski Nauchnykh Seminarov POMI, Algebraic numbers and finite groups, Tome 86 (1979), pp. 40-48
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One investigates the relation between even and odd unimodular lattices in $\mathbf R^n$. One constructs the operation of taking even associates for odd lattices. One computes the action of this operation upon the theta-series. One investigates the even associates of lattices of the form $\Lambda\oplus\mathbf Z^s$.