@article{JOLT_2013_23_2_a9,
     author = {D. Degrijse},
     title = {On a {Filtration} of the {Second} {Cohomology} of {Nilpotent} {Lie} {Algebras}},
     journal = {Journal of Lie Theory},
     pages = {551--573},
     year = {2013},
     volume = {23},
     number = {2},
     doi = {10.5802/jolt.737},
     zbl = {1286.17018},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.737/}
}