@article{NSJOM_2006_36_1a_5,
     author = {T. Noiri and V. Popa},
     title = {Some properties of weakly open

 functions in bitopological spaces},
     journal = {Novi Sad Journal of Mathematics},
     pages = {47-54},
     publisher = {mathdoc},
     volume = {36},
     number = {1},
     year = {2006},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2006_36_1a_5/}
}