@article{AMI_2015_45_a13,
     author = {Ferenc V\'arady},
     title = {Introduction of differential calculus in the class 10 with graphical calculator},
     journal = {Annales mathematicae et informaticae},
     pages = {161--177},
     publisher = {mathdoc},
     volume = {45},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2015_45_a13/}
}