D.  Bagal-Kestwal, Karve, M. S., Kakade, B. A., and Pillai, V. K., ?Invertase inhibition based electrochemical sensor for the detection of heavy metal ions in aqueous system: application of ultra-microlelectrode to enhance sucrose biosensor's sensitivity?, Biosensors & Bioelectronics, vol. 24, no. 4, pp. 657-664, 2008.