@book{6064,
	author = {Johnson, D. L.},
	title = {Topics in the theory of group presentations /},
	publisher = {Cambridge University Press,},
	year = {1980.},
	series = {London Mathematical Society lecture note series ; 42},
	address = {Cambridge [Eng.] ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0808/80040230-d.html}
}