Reference
Khidrotekhnika i melioratsii (Bulgaria),11, No. 9 (September, 1966), pp. 262–267, six illustrations, two tables.
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From foreign journals. Hydrotechnical Construction 2, 547–548 (1968). https://doi.org/10.1007/BF02378143
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DOI: https://doi.org/10.1007/BF02378143