%0 Journal Article %A Georg Regensburger %A Markus Rosenkranz %D 2009 %8 Array %P 123-151 %T An Algebraic Foundation for Factoring Linear Boundary Problems %U http://dx.doi.org/10.1007/s10231-008-0068-3 %V 188 %N 1 %J Ann. Mat. Pura Appl. (4)