@article{MABA_2002_16_1-4_a9,
     author = {G. Anastassiou},
     title = {On {H-Fuzzy} {Differentiation}},
     journal = {Mathematica balkanica},
     pages = {153},
     year = {2002},
     volume = {16},
     number = {1-4},
     url = {http://geodesic.mathdoc.fr/item/MABA_2002_16_1-4_a9/}
}