@article{NSJOM_2002_32_1a_1,
     author = {V. 

 Popa, T. Noiri},
     title = {On upper and lower weakly a-continuous 

 multifunctions},
     journal = {Novi Sad Journal of Mathematics},
     pages = {7-24},
     year = {2002},
     volume = {32},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2002_32_1a_1/}
}