Voltage equalization of an ultracapacitor module by cell grouping using number partitioning algorithm In English Oyarbide, E., Bernal, C. Molina, P. Jiménez, L.A., Gálvez, R., Martínez, A: “Voltage equalization of an ultracapacitor module by cell grouping using number partitioning algorithm”, Journal of Power Sources, Elsevier, 2016 You can access this paper through ScienceDrirect here https://www.sciencedirect.com/science/article/abs/pii/S0378775315303402 or under request