Geodesic
New restrictions on the topology of real curves of degree a multiple of~8
Izvestiya. Mathematics , Tome 37 (1991) no. 2, pp. 421-443

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Two geometrical constructions are given which enable one to rule out certain arrangements of ovals of real plane curves of degree a multiple of 8. In particular, for degree 8 one cannot have an $M$-curve for which one oval envelopes the other ovals. 
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     author = {E. I. Shustin},
     title = {New restrictions on the topology of real curves of degree a multiple of~8},
     journal = {Izvestiya. Mathematics },
     pages = {421--443},
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     volume = {37},
     number = {2},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1991_37_2_a7/}
}
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E. I. Shustin. New restrictions on the topology of real curves of degree a multiple of~8. Izvestiya. Mathematics , Tome 37 (1991) no. 2, pp. 421-443. http://geodesic.mathdoc.fr/item/IM2_1991_37_2_a7/