@article{JOLT_2002_12_2_a9,
     author = {M. H. Lee},
     title = {Casimir {Operators} on {Pseudodifferential} {Operators} of {Several} {Variables}},
     journal = {Journal of Lie Theory},
     pages = {483--493},
     year = {2002},
     volume = {12},
     number = {2},
     doi = {10.5802/jolt.275},
     zbl = {1062.11025},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.275/}
}