@article{SF_1994__48_3_135300,
     author = {M. Ishikawa},
     title = {Admissible and regular potentials for positive {Co-semigroups} and application to heat semigroups.},
     journal = {Semigroup forum},
     pages = {96--106},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1994},
     zbl = {0817.47050},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__48_3_135300/}
}