The greenway as a means to recover valley floor areas: A proposal for the Mandacarú stream, Maringá, Paraná State, Brazil - doi: 10.4025/actascitechnol.v34i4.12529. Acta Sci. Technol. 2012;34(4):365-372. doi:10.4025/actascitechnol.v34i4.12529