On filters for city water-works.
Fränkel and Piefke. Zeitschrift für Hygiene, 1891, p. 38.
Leistungen der Sandfiltern. An account of the partial obstruction of the Stralau filters by ice, and a typhoid epidemic which followed. Experiments were then made upon the passage of cholera and typhoid germs through small filters.
Piefke. Journal für Gas- und Wasserversorgung, 1891, p. 208. Neue Ermittelungen über Sandfiltration.
The above mentioned experiments being objected to on certain grounds, they were repeated by Piefke alone, confirming the previous observations on the passage of bacteria through filters, but under other conditions.
—— Zeitschrift für Hygiene, 1894, p. 151, Über Betriebsführung von Sandfiltern.
A full account of the operation of the Stralau filters in 1893, with discussion of the efficiency of filtration, etc.
Plagge and Proskauer. Zeitschrift für Hygiene, 11. p. 403.
Examination of water before and after filtration at Berlin, with theory of filtration.
Reincke. Bericht über die Medicinische Statistik des Hamburgischen Staates für 1892.