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C. V.-B. Tribuzy, S. M. Landi, M. P. Pires, R. Butendeich, P. L. Souza, A. C. Bittencourt, G. E. Marques, A. B. Henriques. "nipi delta-doping superlattices for amplitude modulation." Brazilian journal of physics 32.2a (2002) 269-274