P. Abramenko et B. Muhlherr, PRESENTATION BY AMALGAMATION OF CERTAIN T WIN BN-PAIRS, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 325(7), 1997, pp. 701-706
We give a presentation by amalgamation of certain twin BN-pairs. Our r
esult generalizes a theorem of Tits about spherical BN-pairs. Applying
the theory of twin buildings, both authors obtained the result by dif
ferent methods.