Geodesic
Classification of surfaces of degree four having a~nonsimple singular point
Izvestiya. Mathematics , Tome 35 (1990) no. 3, pp. 607-627

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The author obtains a classification, to within a rigid isotopy (i.e. an isotopy in the class of algebraic surfaces), of algebraic surfaces of degree four in $\mathbf Cp^3$ with isolated singularities which have at least one nonsimple singular point (i.e. a singular point different from $A_p$, $D_p$, $E_6$, $E_7$, and $E_8$). Tables: 4. Figures: 6. Bibliography: 10 titles. 
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     author = {A. I. Degtyarev},
     title = {Classification of surfaces of degree four having a~nonsimple singular point},
     journal = {Izvestiya. Mathematics },
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     volume = {35},
     number = {3},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1990_35_3_a4/}
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A. I. Degtyarev. Classification of surfaces of degree four having a~nonsimple singular point. Izvestiya. Mathematics , Tome 35 (1990) no. 3, pp. 607-627. http://geodesic.mathdoc.fr/item/IM2_1990_35_3_a4/