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- [3] On the classification of 4-dimensional flexible projective planes MOSTLY FINITE GEOMETRIES: IN CELEBRATION OF T G OSTROM'S 80TH BIRTHDAY, 1997, 190 : 9 - 33
- [7] Nonclassical 4-Dimensional Minkowski Planes Obtained as Brothers of Semiclassical 4-Dimensional Laguerre Planes Geometriae Dedicata, 1998, 72 : 143 - 169