@article{JGG_2003_7_1_JGG_2003_7_1_a0,
     author = {Z. Cerin},
     title = {Homology and {Orthology} with {Triangles} for {Central} {Points} of {Variable} {Flanks}},
     journal = {Journal for geometry and graphics},
     pages = {001--022},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2003},
     url = {http://geodesic.mathdoc.fr/item/JGG_2003_7_1_JGG_2003_7_1_a0/}
}