@inproceedings{inproceedings054b8492,
title   = {Fabric-protected shallow depht slow sand filters preliminary pilot-plant investigations},
author = {Di Bernardo, Luiz and Paterniani, J E S and Graham, N J D},
year = {1991},
publisher = {Awwa/Unh},
booktitle   = {Slow Sand Filtration Workshop}
}