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- [4] Problems of the german water supply ZEITSCHRIFT DES VEREINES DEUTSCHER INGENIEURE, 1929, 73 : 1671 - 1673
- [5] Problems of the german water supply ZEITSCHRIFT DES VEREINES DEUTSCHER INGENIEURE, 1936, 80 : 1134 - 1134
- [7] Public and Private Ownership of Water Supply Utilities ANNALS OF THE AMERICAN ACADEMY OF POLITICAL AND SOCIAL SCIENCE, 1939, 201 : 89 - 95