Boniver, F. (2000). Projectively Equivariant Symbol Calculus for Bidifferential Operators. Letters in Mathematical Physics, 54 (2), 83-100. doi:10.1023/A:1010863426830 https://hdl.handle.net/2268/95742
Boniver, F. (2000). Projectively Equivariant Symbol Calculus for Bidifferential Operators. Letters in Mathematical Physics, 54 (2), 83-100. doi:10.1023/A:1010863426830