Krūmiņš, K., V. Pētersons, and V. Plociņš. “Features of Implementation of the Modified ‘up-and-Down’ Method”. Elektronika ir Elektrotechnika 93, no. 5 (May 20, 2009): 51–54. Accessed January 23, 2026. https://eejournal.ktu.lt/index.php/elt/article/view/10180.