R. K. NEGI, et al. “ULTRASTRUCTURE OF THE SCALE OF HILLSTREAM FISH, SCHISTURA MONTANUS (MCCLELLAND) AND ITS PHYLOGENIC SIGNIFICANCE”. The Bioscan, vol. 5, no. 3, Aug. 2010, pp. 395-7, https://thebioscan.com/index.php/pub/article/view/168.