Acetic acid as a signal enhancing contrast agent in fluorescence spectroscopy, Rebecca Richards-Kortum, Anant Agrawal, Costas Pitris, Urs Utzinger, Carrie Brookner, Michele Follen Mitchell, U.S. 6,241,662 June 2001, European patent application 98953808.7-2112, 1998.

Combined fluorescence and reflectance spectroscopy, Urs Utzinger, Anthony Durkin, Holger Fuchs, Ann M. Gillenwater, Douglas Heintzelman, Rebecca Richards-Kortum, U.S. 6,571,118, 2003.

Methods and apparatus for polarized reflectance spectroscopy, Konstantin Sokolov, Rebekah Drezek, Urs Utzinger, Rebecca R. Richards-Kortum, U. S. 6,639,674, 2003.

Method and apparatus for the characterization of tissue of epithelial lined viscus, Rebecca Richards-Kortum, , Michele Follen-Mitchell, Urs Utzinger, U.S. Patent 6,697,666 February 24, 2004, Japanese Patent 10-508023, 1999, European Patent 97937053.3-2305, 1996, Canadian Patent 2,264,860, 1999.

Method and apparatus for diagnostic multispectral digital imaging, Urs Utzinger, Rebecca Richards-Kortum, Calum MacAulay, Michele Follen, U.S. Patent 6,766,184, 2004.

Method for probabilistically classifying tissue in vitro and in vivo using fluorescence spectroscopy, Rebecca Richards-Kortum, Nirmala Ramanujam, Anita Mahadevan-Jansen, Michele Follen, Urs Utzinger, U.S. Patent 7,236,815, 2007.