Geodesic
Pencils of lines and the topology of real algebraic curves
Izvestiya. Mathematics , Tome 21 (1983) no. 1, pp. 161-170.

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Using a pencil of lines, a new restriction on the location of ovals of a nonsingular plane curve is obtained. It turns out that the location of a curve separating its complexification with respect to a pencil of lines determines to a significant degree the complex orientation of the curve. Furthermore, a new invariant of the strict isotopy type of the curve is given, which in particular distinguishes some seventh degree $M$-curves with the same complex scheme. A restriction on the complex orientation of seventh degree $M$-curves is proved. Bibliography: 9 titles. 
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T. Fidler. Pencils of lines and the topology of real algebraic curves. Izvestiya. Mathematics , Tome 21 (1983) no. 1, pp. 161-170. http://geodesic.mathdoc.fr/item/IM2_1983_21_1_a5/

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