Satheesh, K., and V. Rao. “SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF TRACE AMOUNT OF TUNGSTEN (VI) IN ALLOY SAMPLES USING 4-HYDROXYBENZALDEHYDETHIOSEMICARBAZON”. Journal of Advanced Scientific Research, Vol. 6, no. 02, May 2015, pp. 14-17, https://sciensage.info/index.php/JASR/article/view/219.