@Article{rosenthal1973invention,
  author = {Rosenthal, Earl},
  title  = {The Invention of the Columnar Device of Emperor Charles V at the Court of Burgundy in Flanders in 1516},
  journal = {Journal of the Warburg and Courtauld Institutes},
  year   = {1973},
  number = {},
  url    = {},

  const  = {\ text}
}
@Article{rosenthal1971ultra,
  author = {Rosenthal, Earl},
  title  = {Plus ultra, non plus ultra, and the Columnar Device of Emperor Charles V},
  journal = {Journal of the Warburg and Courtauld Institutes},
  year   = {1971},
  number = {},
  url    = {},

  const  = {\ text}
}