@article{RCM_2015_49_1_a2,
     author = {Jaiberth Porras and John B. Baena and Jintai Ding},
     title = {New {Candidates} for {Multivariate} {Trapdoor} {Functions}},
     journal = {Revista colombiana de matematicas},
     pages = {57--76},
     publisher = {mathdoc},
     volume = {49},
     number = {1},
     year = {2015},
     url = {http://geodesic.mathdoc.fr/item/RCM_2015_49_1_a2/}
}