Hello all,
I’ve found a typo in root documentation (5-34-30 for sure, and previous ones too).
In line 9 of the .cxx…
// M. Matsumoto and T. Nishimura,
// Mersenne Twistor: A 623-diminsionally equidistributed
and 21 of the .h:
//////////////////////////////////////////////////////////////////////////
// //
// TRandom3 //
// //
// random number generator class: Mersenne Twistor //
// //
//////////////////////////////////////////////////////////////////////////
Mersenne Twistor instead of Mersenne Twister. 
Have fun
gf