@article{JOLT_2020_30_1_a9,
     author = {H. Abels and E. B. Vinberg},
     title = {Subsemigroups of {Nilpotent} {Lie} {Groups}},
     journal = {Journal of Lie Theory},
     pages = {171--178},
     year = {2020},
     volume = {30},
     number = {1},
     doi = {10.5802/jolt.1109},
     zbl = {1441.22011},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.1109/}
}