@article{MZ_1973__135_171993,
     author = {Martin L. Newell},
     title = {Splitting {Theorems} and {Engel} {Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {37--42},
     publisher = {mathdoc},
     volume = {135},
     year = {1973},
     zbl = {0258.20043},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__135_171993/}
}