@article{JOLT_1992_2_1_a2,
     author = {K.-H. Neeb and D. Mittenhuber},
     title = { On the {Exponential} {Function} of an {Invariant} {Lie} {Semigroup}},
     journal = {Journal of Lie Theory},
     pages = {21--30},
     year = {1992},
     volume = {2},
     number = {1},
     doi = {10.5802/jolt.28},
     zbl = {0779.22003},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.28/}
}