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://eejournal.ktu.lt/index.php/elt/article/view/10222.