@article{SMJ2_2020_46_2_a3,
     author = {Kostov, Vladimir},
     title = {Hyperbolic polynomials and canonical sign patterns},
     journal = {Serdica Mathematical Journal},
     pages = {135--150},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2020_46_2_a3/}
}