References
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- Shult , E. 1988 . Freiburg Lecture Notes , 32 ( 2 ) in preparation
- Tits , J. 1981 . “ A local approach to buildings ” . In The Geometric Vein (the Coxeter Festschrift) , Edited by: Davis , C. , Grünbaum , B. and Sherk , F.A. 519 – 547 . Berlin : Springer Verlag .