Gunawan, G., A. S. A. Utomo, and Y. Yanuar. “Investigation Skin Friction Reduction Using Nano Bubble Injection on Flat Plates”. Journal of Advanced Research in Micro and Nano Engineering, vol. 1, no. 1, Oct. 2020, pp. 15-23, https://akademiabaru.com/submit/index.php/armne/article/view/1073.