@article{01865992,
title = {Distance-preserving maps in generalized polygons. II: Maps on points and/or lines.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {43},
year = {2002},
pages = {303-324},
zbl = {1023.51004},
language = {en},
url = {http://dml.mathdoc.fr/item/01865992}
}
Govaert, Eline; Van Maldeghem Hendrik. Distance-preserving maps in generalized polygons. II: Maps on points and/or lines.. Beiträge zur Algebra und Geometrie, Tome 43 (2002) pp. 303-324. http://gdmltest.u-ga.fr/item/01865992/