Vats, Purva and Banerjee, U C  (2005) Biochemical characterisation of extracellular phytase (myo-inositol hexakisphosphate phosphohydrolase) from a hyper-producing strain of Aspergillus niger van Teighem.  Journal of industrial microbiology & biotechnology, 32 (4).  pp. 141-7.  ISSN 1367-5435