Multilayered artifacts in the pre-Columbian metallurgy from the North of Peru - Cesareo, Roberto; Bustamante, Angel D; Fabian, Julio S; Zambrano, Sandra Del Pilar; Alva, Walter; Chero, Luis Z; Espinoza, Maria C Del Carmen; Rodriguez, Rosendo R; Seclen, Marco F; Gutierrez, Fidel V; Levano, Edgard B; Gonzales, Juan A; et al. (Applied Physics A, 2013)