@article{10_21136_MB_2006_134083,
     author = {Harlenderov\'a, Magdalena and Rach\r{u}nek, Ji\v{r}{\'\i}},
     title = {Modal operators on {MV-algebras}},
     journal = {Mathematica Bohemica},
     pages = {39--48},
     publisher = {mathdoc},
     volume = {131},
     number = {1},
     year = {2006},
     doi = {10.21136/MB.2006.134083},
     mrnumber = {2211002},
     zbl = {1112.06014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2006.134083/}
}