@article{CMJ_2004__54_1_a21,
     author = {Shum, K. P. and Ren, X. M.},
     title = {On super hamiltonian semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {247--252},
     publisher = {mathdoc},
     volume = {54},
     number = {1},
     year = {2004},
     mrnumber = {2040236},
     zbl = {1051.20024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2004__54_1_a21/}
}