@article{SF_1992__45_3_135199,
     author = {R. de Laubenfels and K. Boyadzhiev},
     title = {Semigroups and resolvents of bounded variation, imaginary powers and {H{\textdegree}{\textdegree}} functional calculus.},
     journal = {Semigroup forum},
     pages = {372--384},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1992},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__45_3_135199/}
}