@article{MR_1997_48_a6,
     author = {Ladislav Skula},
     title = {Categories of {Semigroups} with {Divisor} {Theory}},
     journal = {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta} E\ensuremath{\pi}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\acute\omega}\ensuremath{\rho}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}},
     pages = {85--91},
     year = {1997},
     volume = {48},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1997_48_a6/}
}