@article {simmons1963,
	title = {Elastic Constants of Pyrite},
	journal = {Journal of Applied Physics},
	volume = {34},
	year = {1963},
	month = {Jan-09-1963},
	pages = {2736 - 2738},
	issn = {0021-8979},
	doi = {10.1063/1.1729801},
	url = {http://aip.scitation.org/doi/10.1063/1.1729801http://aip.scitation.org/doi/pdf/10.1063/1.1729801},
	author = {Simmons, Gene and Birch, Francis}
}
