@article{TM2_2013_XVI_1_a1,
     author = {Haryono Tandra},
     title = {On computing the derivative of a function},
     journal = {The Teaching of Mathematics},
     pages = {6 },
     year = {2013},
     volume = {XVI},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM2_2013_XVI_1_a1/}
}