@article{SF_1997__54_2_135505,
     author = {R. de Laubenfels and F. Yao},
     title = {Regularized semigroups of bounded semivariation.},
     journal = {Semigroup forum},
     pages = {43--57},
     publisher = {mathdoc},
     volume = {54},
     number = {2},
     year = {1997},
     zbl = {0897.47034},
     url = {http://geodesic.mathdoc.fr/item/SF_1997__54_2_135505/}
}