AXELSSON, Owe, LUKÁŠ, D. Preconditioners for Time-Harmonic Optimal Control Eddy-Current Problems. In: Lecture Notes in Computer Science. Berlin: Springer International Publishing AG, 2018, s. 47-54. ISBN 978-3-319-73440-8. ISSN 0302-9743. E-ISSN 1611-3349. Dostupné z: https://doi.org/10.1007/978-3-319-73441-5_4.