Hirai, S., M. Komura, V. Saechout, S. Sugaya, S. Aoki, and T. Takahashi. 2009. “Development of High Density Micro-Bubble Generator for Environmental Technology”. Elektronika Ir Elektrotechnika 92 (4): 37-40. https://doi.org/10.5755/j02.eie.10222.