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Real plane algebraic curves with asymptotically maximal number of even ovals

It has been known for a long time that a nonsingular real algebraic curve of degree 2k in the projective plane cannot have more than 7k^2/4-9k/4+3/2 even ovals. We show here that this upper bound is asymptotically sharp, that is to say we construct a family of curves of degree 2k such that p/k^2 tends to 7/4, where p is the number of even ovals of the curves. We also show that the same kind of result is valid dealing with odd ovals.