@article{RM_1997_52_6_a18,
     author = {S. M. Natanzon},
     title = {A theorem of {Harnack} type for a family of complexly isomorphic real algebraic curves},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1314--1315},
     publisher = {mathdoc},
     volume = {52},
     number = {6},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1997_52_6_a18/}
}