@article{10_1017_fms_2024_45,
     author = {Grigoriy Blekherman and Justin Chen and Jaewoo Jung},
     title = {Sums of squares, {Hankel} index and almost real rank},
     journal = {Forum of Mathematics, Sigma},
     publisher = {mathdoc},
     volume = {12},
     year = {2024},
     doi = {10.1017/fms.2024.45},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/fms.2024.45/}
}