B. P. REYDON, A. C. ORTEGA, and J. G. D. SILVA, “TECHNOLOGICAL INNOVATIONS AT THE LEVEL OF PRODUCTS IN THE STATE OF SÃO PAULO”, CC&T, vol. 4, no. 3, pp. 255–332, Jan. 1987, doi: 10.35977/0104-1096.cct1987.v4.9170.