@article {218397,
	title = {Laser-induced breakdown spectroscopy (LIBS) on geological materials: Relative hardness estimation},
	journal = {Materials Today: Proceedings},
	volume = {36},
	year = {2021},
	pages = {600},
	author = {Panya Panya and A.H. Galmed and M. Maaza and M.A.Harith}
}
