by Mahasinghe, A, Wang, J B
Published in Journal of physics. A, Mathematical and theoretical (08.07.2016)

by Chugunov, V.N., Ikramov, Kh.D.
Published in Linear algebra and its applications (01.08.2015)

by Mahasinghe, A, Wang, J B
Published in arXiv.org (25.05.2016)

by Mastronardi, Nicola, Van Barel, Marc, Vandebril, Raf
Published in Electronic transactions on numerical analysis (01.08.2008)

by Huckle, Thomas K, Noutsos, Dimitrios
Published in Electronic transactions on numerical analysis (01.12.2007)