@book{196577,
	author = {Huerta, Carlos},
	title = {NOV rig census shows global rig market entering expansion cycle},
	year = {nov./dic. 2018},
	note = {Onshore, tightness of top-tier rigs will drive new rig orders, upgrades; offshore drilling growing modestly, but oversupply to sustain pressure on fleet utilization.}
}