@article{TM2_2012_XV_1_a0,
     author = {Mat{\'\i}as Camacho-Mach{\'\i}n and Josefa Perdomo-D{\'\i}az and Manuel Santos-Trigo},
     title = {An exploration of students' conceptual knowledge built in a first ordinary differential equations course {(Part} {I)}},
     journal = {The Teaching of Mathematics},
     pages = {1 },
     publisher = {mathdoc},
     volume = {XV},
     number = {1},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM2_2012_XV_1_a0/}
}