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A,B,C,D,E,F, etc. (English) Zbl 0431.15020
Sémin. sur les singularités des surfaces, Cent. Math. Éc. Polytech., Palaiseau 1976-77, Lect. Notes Math. 777, 221-227 (1980).

MSC:
15A63 Quadratic and bilinear forms, inner products
11E16 General binary quadratic forms
51F15 Reflection groups, reflection geometries
14B05 Singularities in algebraic geometry
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