@article{FORUM_1990__2_3_141632,
     author = {Klaus-J. Engel and Rainer Nagel},
     title = {Cauchy {Problems} for {Polynomial} {Operator} {Matrices} on {Abstract} {Energy} {Spaces.}},
     journal = {Forum mathematicum},
     pages = {89--102},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1990},
     zbl = {0698.47024},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1990__2_3_141632/}
}