@article {el2013evaluation,
	title = {Evaluation of SPT energy for Donut and Safety hammers using CPT measurements in Egypt},
	journal = {Ain Shams Engineering Journal},
	volume = {4},
	number = {4},
	year = {2013},
	note = {n/a},
	pages = {701{\textendash}708},
	publisher = {Elsevier},
	abstract = {n/a},
	author = {El-Sherbiny, Rami M and Salem, Manal A}
}
