@article{MZ_1974__137_172076,
     author = {J.S. Williams},
     title = {Nielsen {Equivalence} of {Presentations} of {Some} {Solvable} {Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {351--362},
     publisher = {mathdoc},
     volume = {137},
     year = {1974},
     zbl = {0275.20093},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__137_172076/}
}