1 2 Webpath website http://library.med.utah.edu/WebPath/HISTHTML/MANUALS/FONTANA.PDF Accessed 4 February 2009 ↑ "Oxidation of aldehydes and ketones". www.chemguide.co.uk. Retrieved 31 January 2010. ↑ Oshitna, K.; Tollens, B. (1901). "Ueber Spectral-reactionen des Methylfurfurols".