@article{RM_1980_35_1_a10,
     author = {S. M. Natanzon},
     title = {On the total number of ovals of real forms of a~complex algebraic curve},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {223--224},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {1980},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1980_35_1_a10/}
}