@article{JOLT_1993_3_1_a4,
     author = {K. H. Hofmann and J. D. Lawson and W. A. F. Ruppert},
     title = { On {Finiteness} {Theorems} and {Porcupine} {Varieties} in {Lie} {Algebras}},
     journal = {Journal of Lie Theory},
     pages = {49--64},
     year = {1993},
     volume = {3},
     number = {1},
     zbl = {0791.22005},
     url = {http://geodesic.mathdoc.fr/item/JOLT_1993_3_1_a4/}
}