@article{10_1090_jams_847,
     author = {Blekherman, Grigoriy and Smith, Gregory and Velasco, Mauricio},
     title = {Sums of squares and varieties of minimal degree},
     journal = {Journal of the American Mathematical Society},
     pages = {893--913},
     publisher = {mathdoc},
     volume = {29},
     number = {3},
     year = {2016},
     doi = {10.1090/jams/847},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/jams/847/}
}