@article {fieguth1994high,
	title = {High-accuracy profiler that uses depth from focus},
	journal = {Applied optics},
	volume = {33},
	number = {4},
	year = {1994},
	pages = {686{\textendash}689},
	publisher = {Optical Society of America},
	author = {Fieguth, Paul W and Staelin, David H}
}
