The fan theorem and unique existence of maxima. Berger, J., Bridges, D. S., & Schuster, P. 71(2):713–720, 2006.
bibtex   
@ARTICLE{BBS06,
  author = {Berger, Josef and Bridges, Douglas S. and Schuster, Peter},
  title = {The fan theorem and unique existence of maxima},
  journal = JSL,
  year = {2006},
  volume = {71},
  pages = {713--720},
  number = {2},
  keywords = {bib,con}
}

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