@article{KJM_2004_26_1_a6,
     author = {Samuel Omoloye Ajala},
     title = {Smooth structures on {Pi-manifolds}},
     journal = {Kragujevac Journal of Mathematics},
     pages = {49 - 60},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {2004},
     url = {http://geodesic.mathdoc.fr/item/KJM_2004_26_1_a6/}
}