@book{150861,
	author = {Cooper, G.A. and University of California and University of California},
	title = {A proposal for the real - time measurement of drill bit tooth wear},
	note = {Reproducidos en el sitio web de Payzone Drilling Simulators. ; Navegadores de Internet ; Adobe Acrobat (PDF)},
	url = {http://maxsimul.com/Publications/GRCToothWear.pdf}
}