@article{ARM_2004__40_2_a1,
     author = {Caldas, Miguel and Navalagi, Govindappa},
     title = {On weak forms of preopen and preclosed functions},
     journal = {Archivum mathematicum},
     pages = {119--128},
     publisher = {mathdoc},
     volume = {40},
     number = {2},
     year = {2004},
     mrnumber = {2068686},
     zbl = {1111.54011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2004__40_2_a1/}
}