BibTeX

@ARTICLE{iumj2904,
    author = "Harry Dym and J. William Helton and Scott McCullough",
     title = "Irreducible noncommutative defining polynomials for convex sets have degree 4 or less",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 56,
      year = 2007,
     issue = 3,
     pages = "1189--1232",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "47A; 47A63; 47L07; 47A20; 14P10;",
}

amsrefs

\bib{iumj2904}{article}{
     author = {Dym, Harry},
     author = {Helton, J. William},
     author = {McCullough, Scott},
      title = {Irreducible noncommutative defining polynomials for convex sets have degree 4 or less},
    journal = {Indiana Univ. Math. J.},
     volume = {56},
       year = {2007},
     number = {3},
      pages = {1189 \ndash 1232},
}