@article{rosenthal1971ultra,
  author = {Rosenthal, Earl},
  interhash = {7f5f18ec222b203451971d7b8b99b5f1},
  intrahash = {7bb77fb29f01c59b5b6cc40e2cd6cb30},
  journal = {Journal of the Warburg and Courtauld Institutes},
  pages = {204-228},
  title = {Plus ultra, non plus ultra, and the Columnar Device of Emperor Charles V},
  volume = 34,
  year = 1971
}