AC voltage standard based on a programmable SIS array. - Panu Helistö; Jaani Nissilä; Kari Ojasalo; Jari S. Penttilä; Heikki Seppä (IEEE Trans. Instrum. Meas., 2003)

Realization of a square-wave voltage with externally-shunted SIS Josephson junction arrays for a quantum AC voltage standard. - Jaani Nissilä; Antti Kemppinen; Kari Ojasalo; Juha Hassel; Antti Manninen; Panu Helistö; Heikki Seppä (IEEE Trans. Instrum. Meas., 2005)

Principal Component Compression Method for Covariance Matrices Used for Uncertainty Propagation. - David A. Humphreys; Peter M. Harris; Manuel Rodriguez-Higuero; Faisal Ali Mubarak; Dongsheng Zhao; Kari Ojasalo (IEEE Trans. Instrum. Meas., 2015)