@article {Gandra_J:2011,
	title = {Functionally graded materials produced by friction stir processing},
	journal = {JOURNAL OF MATERIALS PROCESSING TECHNOLOGY},
	volume = {211},
	year = {2011},
	note = {n/a},
	month = {Jan},
	pages = {1659-1668},
	publisher = {TULISBON, Univ Nova Lisboa, IST UTL Inst Super Tecn, Univ Nova Lisboa},
	abstract = {n/a},
	author = {Gandra J and Miranda R and Vilaca P and Velhinho A and Teixeira JP}
}
