Geodesic
The Construction of Perfect and Extreme Forms
Canadian journal of mathematics, Tome 18 (1966) no. 1, pp. 147-158

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Let be a positive quadratic form of determinant D, and let M be the minimum of f(x) for integral x ≠ 0. Then f(x) assumes the value M for a finite number of integral vectors x = ±mk (k = 1 , ... , s) called the minimal vectors. 
Scott, P. R. The Construction of Perfect and Extreme Forms. Canadian journal of mathematics, Tome 18 (1966) no. 1, pp. 147-158. doi: 10.4153/CJM-1966-019-x
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