In situ ultrasonic measurement of crack closure. Rokhlin, S. I. & Kim, J. International journal of fatigue, 25(1):51–58, 2003.
In situ ultrasonic measurement of crack closure [link]Paper  bibtex   
@article{rokhlin_situ_2003-1,
	title = {In situ ultrasonic measurement of crack closure},
	volume = {25},
	url = {http://www.sciencedirect.com/science/article/pii/S0142112302000567},
	number = {1},
	urldate = {2015-12-04TZ},
	journal = {International journal of fatigue},
	author = {Rokhlin, S. I. and Kim, J.-Y.},
	year = {2003},
	pages = {51--58}
}

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