@article {essa2007simple,
	title = {A simple formula for shape and depth determination from residual gravity anomalies},
	journal = {Acta Geophysica},
	volume = {55},
	number = {2},
	year = {2007},
	note = {n/a},
	pages = {182{\textendash}190},
	publisher = {Versita},
	abstract = {n/a},
	author = {Khalid S. Essa}
}
