B. Muhlherr et H. Vanmaldeghem, ON CERTAIN TWIN BUILDINGS OVER TREE DIAGRAMS, Bulletin of the Belgian Mathematical Society Simon Stevin, 5(2-3), 1998, pp. 393-402
We classify twin buildings over tree diagrams such that all rank 2 res
idues are either finite Moufang polygons but no octagons, or Moufang p
olygons associated to the groups PGL(3), PSp(4) or G(2). As a byproduc
t, we obtain some results on Moufang sets.