@article{NSJOM_1994_24_1a_28,
     author = {Putnik, Zoran},
     title = {Educational "turtle" {\textendash} 

 using "turtle" graphics in computer education},
     journal = {Novi Sad Journal of Mathematics},
     pages = {321-329},
     year = {1994},
     volume = {24},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1994_24_1a_28/}
}