@article{TM2_2002_V_1_a1,
     author = {Martti E. Pesonen and Lenni Haapasalo and Hanna Lehtola},
     title = {Looking at {Function} {Concept} {Through} {Interactive} {Animations}},
     journal = {The Teaching of Mathematics},
     pages = {37 },
     year = {2002},
     volume = {V},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM2_2002_V_1_a1/}
}