  This paper is a short version of the author habilitation thesis. The main
results have been already published but here a lot of details are clarified. As
well we add some new results: we discuss some quasi classical limit of ALG(a) -
quantization, mention some topological properties of the moduli space of Bohr -
Sommerfeld Lagrangian cycles of fixed type and investigate some properties of
the Kaehler structure on it.
