1. Alva, W., 2006. SIPAN. descrubrimiento e investigation. Quebecor World Perù S.A.
2. Alva, W., Donnan, C.B., 1993. The Royal Tomb of Sipán. Los Angeles Fowler Museum of Cultural history, University of California.
3. Berger, M.J., Hubbell, J.H., 1979. XCOM: photon cross sections on a personal computer. US Dept. of Commerce, NBSIR 87-3597.
4. Portable equipment for X-ray fluorescence analysis;Cesareo,2004
5. Determination of the thickness of coatings by means of a new XRF spectrometer