@conference {Gandra_Jo{\~a}o:2012, title = {Production of functionally graded surface composites by friction surfacing}, series = {Mechanics of Nano, Micro and Macro Composite Structures}, year = {2012}, note = {n/a}, month = {Jan}, pages = {1-2}, type = {Peer reviewed}, abstract = {n/a}, author = {Gandra Jo{\~a}o and Miranda Rosa M. and Vila{\c c}a Pedro and Velhinho Alexandre} }