@article{BMMS_2007_30_1_a5,
     author = {Diego Bravo and Juan Rada},
     title = {Coalescence of {Difans} and {Diwheels}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2007},
     volume = {30},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2007_30_1_a5/}
}