Chen, Chien-Chih, and Chen-Ching Ting. “Investigating the Effect of Color Mask on Sensitivity for the Color Schlieren Imaging”. International Journal of Engineering and Technology Innovation 3, no. 2 (April 1, 2013): 114-122. Accessed October 20, 2021. https://ojs.imeti.org/index.php/IJETI/article/view/103.