Anchawale, S., M. P. R. Rao, and Y. Nerkar. “Optimization of water-based ink formulation based on different NCO : OH ratios of polyurethane dispersion: 10.14622/JPMTR-2005”. Journal of Print and Media Technology Research, vol. 9, no. 3, Sept. 2020, pp. 145-61, https://jpmtr.org/index.php/journal/article/view/7.