@article{JOLT_1992_2_1_a6,
     author = {A. Eggert},
     title = { Extending the {Campbell-Hausdorff} {Multiplication}},
     journal = {Journal of Lie Theory},
     pages = {59--62},
     year = {1992},
     volume = {2},
     number = {1},
     doi = {10.5802/jolt.32},
     zbl = {0800.17001},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.32/}
}