@article{SF_1994__49_2_135356,
     author = {A. Bobrowski},
     title = {Degenerate convergence of semigroups.},
     journal = {Semigroup forum},
     pages = {303--328},
     year = {1994},
     volume = {49},
     number = {2},
     zbl = {0817.47047},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135356/}
}