@article{10_21136_CMJ_1983_101864,
     author = {Cherubini, Alessandra and Varisco, Ada},
     title = {Quasi {Hamiltonian} semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {131--140},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1983},
     doi = {10.21136/CMJ.1983.101864},
     mrnumber = {687426},
     zbl = {0517.20040},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1983.101864/}
}