@article{Orlov2017historical,
author={Orlov, E.V. and Shipkov, O.I. and Peregudov, D.A.},
title={Historical aspects of the development of water supply and sanitation systems in the Middle Ages and their impact on the current ecological situation in developing countries},
journal={},
publisher={INFRA-M Academic Publishing LLC.},
year={2017},
pages={9-15},
volume={2},
issue={4},
}