T Leuther, F Radoux - SIGMA. Symmetry, Integrability and Geometry …, 2011 - emis.de
The existence of a natural and projectively invariant quantization in the sense of P. Lecomte
[Progr. Theoret. Phys. Suppl.(2001), no. 144, 125-132] was proved by M. Bordemann [math …