On distance preserving transformations of Euclidean-like planes over the rational fields. (Short Communication). Bijan Farrahi — 1976 Aequationes mathematicae
On distance preserving transformations of Euclidean-like planes over the rational fields. Bijan Farrahi — 1976 Aequationes mathematicae
On the Group of Transformations of Constructible Euclidean Planes with Preserve a Single Distance. Bijan Farrahi — 1977 Jahresbericht der Deutschen Mathematiker-Vereinigung