Novel notch filter in transistor-only filters domain. - Andrzej Guzinski; Andrzej Kielbasinski (ICECS, 1996)

Another simple transistor-only lumped-distributed tunable low-pass filter. - Andrzej Kielbasinski (ICECS, 2002)

Numerical Behaviour of Higham's Scaled Method for Polar Decomposition. - Andrzej Kielbasinski; Krystyna Zietak (Numer. Algorithms, 2003)

Note on "A New Scaling for Newton's Iteration for the Polar Decomposition and Its Backward Stability" by R. Byers and H. Xu. - Andrzej Kielbasinski; Krystyna Zietak (SIAM J. Matrix Anal. Appl., 2009)

On iterative algorithms for the polar decomposition of a matrix and the matrix sign function. - Andrzej Kielbasinski; Pawel Zielinski 001; Krystyna Zietak (Appl. Math. Comput., 2015)