Geodesic
A Theorem on Harmonic Homologies
Canadian mathematical bulletin, Tome 8 (1965) no. 3, pp. 375-377

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DOI

A collineation is a one-one mapping of a projective plane onto itself, taking points into points, lines into lines and preserving incidence, ([1], p. 247). A perspective collineation (sometimes called a central collineation) is a collineation which leaves invariant all points on a line h called the axis, and all lines through a point H called the centre. The perspective collineation is an elation if H is incident with h; otherwise it is a homology. 
Marsden, J. E. A Theorem on Harmonic Homologies. Canadian mathematical bulletin, Tome 8 (1965) no. 3, pp. 375-377. doi: 10.4153/CMB-1965-028-5
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     author = {Marsden, J. E.},
     title = {A {Theorem} on {Harmonic} {Homologies}},
     journal = {Canadian mathematical bulletin},
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     year = {1965},
     volume = {8},
     number = {3},
     doi = {10.4153/CMB-1965-028-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-028-5/}
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