Geodesic
A Note on Affine Pappus Conditions
Canadian mathematical bulletin, Tome 10 (1967) no. 3, pp. 453-457

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Let l, m, n be three mutually distinct lines in the projective plane. The (l, m, n)-Pappus condition can be described as follows.Let A, B, C, A', B', C' be any six mutually distinct points such that A, B, C lie on l; A', B', C' lie on m; and none of these points lies on l∩m, m∩n, or n∩l. If the points AB'∩BA' and BC'∩CB' both lie on n, then the point AC'∩CA' also lies on n. 
Lane, N. D. A Note on Affine Pappus Conditions. Canadian mathematical bulletin, Tome 10 (1967) no. 3, pp. 453-457. doi: 10.4153/CMB-1967-043-2
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     title = {A {Note} on {Affine} {Pappus} {Conditions}},
     journal = {Canadian mathematical bulletin},
     pages = {453--457},
     year = {1967},
     volume = {10},
     number = {3},
     doi = {10.4153/CMB-1967-043-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-043-2/}
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