@article{JOLT_2002_12_1_a11,
     author = {E. G. F. Thomas},
     title = {An {Invariant} {Symmetric} {Non-Selfadjoint} {Differential} {Operator}},
     journal = {Journal of Lie Theory},
     pages = {245--257},
     year = {2002},
     volume = {12},
     number = {1},
     doi = {10.5802/jolt.260},
     zbl = {1010.22017},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.260/}
}