Lechiu, Bruno Cezar Gardens, et al. “Use of High Resolution Images of Orbital Surface of Waterproofing With Different Levels of Urban Land: Case Irati-PR”. Semina: Ciências Exatas E Tecnológicas, vol. 33, no. 2, Nov. 2012, pp. 127-40, doi:10.5433/1679-0375.2012v33n2p127.