Bretas, W. V., Morais, A. S. C., Hora, H. R. M. da and Azevedo Filho, E. T. (2019) “Knowledge extraction on international markets from patent bases: a study on green patents”, Brazilian Journal of Operations & Production Management, 16(4), pp. 698–705. doi: 10.14488/BJOPM.2019.v16.n4.a14.