@article{GDZPPN002441438, title = {Matrices of operators and regularized semigroups.}, journal = {Mathematische Zeitschrift}, volume = {212}, year = {1993}, pages = {619-630}, zbl = {0792.47041}, url = {http://dml.mathdoc.fr/item/GDZPPN002441438} }
Laubenfels, R. de. Matrices of operators and regularized semigroups.. Mathematische Zeitschrift, Tome 212 (1993) pp. 619-630. http://gdmltest.u-ga.fr/item/GDZPPN002441438/