1. Wiley Encyclopedia of Food Science and Technology,1999
2. Citric, fumaric and malic acids, in Biotechnology and Food Ingredients;Goldberg,1991
3. Applied Biocatalysis,1994
4. www.uwlax.edu/faculty/weaver/fumarase.html (16.01.2003.)
5. Study on the utilisation of hydrocarbons by microorganisms, XX. Conversion of fumaric acid to L-malic acid;Furukawa;Agr. Biol. Chem.,1970