Integrated earth resistivity tomography (ERT) and multilevel sampling gas: a tool to map geogenic and anthropogenic methane accumulation on brownfield sites - Mendonça, Carlos Alberto; Doherty, Rory; Fornaro, Adalgiza; Abreu, Eduardo L; Novaes, Guilherme C; Fachin, Sergio Junior da Silva; La Scalea, Mauro A (Environmental Earth Sciences, 2015)