@ARTICLE{DooGalAbs2010, author = "Paul Van Dooren and Kyle A. Gallivan and P.-A. Absil", title = "H2-Optimal model reduction with higher-order poles", journal = "SIAM J. Matrix Anal. Appl.", fjournal = "SIAM Journal on Matrix Analysis and Applications", year = 2010, volume = 31, number = 5, pages = "2738-2753", doi = "10.1137/080731591", }