Mezitis, Mareks, and Vladimirs Karevs. “Automatic Measurement for Internal Resistance of Battery in Uninterruptible Power Source”. Electrical, Control and Communication Engineering 25, no. 25 (January 1, 2009): 141–144. Accessed November 5, 2024. https://ecce-journals.rtu.lv/ecce/article/view/v10144-009-0030-2.