The degrees of certain strata of the dual variety
Compositio Mathematica, Tome 38 (1979) no. 2, pp. 241-252. 
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     mrnumber = {528841},
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     url = {http://www.numdam.org/item/CM_1979__38_2_241_0/}
}
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Vainsencher, Israel. The degrees of certain strata of the dual variety. Compositio Mathematica, Tome 38 (1979) no. 2, pp. 241-252. http://www.numdam.org/item/CM_1979__38_2_241_0/

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