Title: Water Leachability of Cement Forms for Medium-Level Waste Immobilization
Authors: ZAMORANI EdmondoSERRINI GiorgioBLANCHARD HerveLANZA Franco
Citation: Nuclear and Chemical Waste Management vol. 6 p. 197-202
Publication Year: 1986
JRC Publication N°: JRC4188
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC4188
Type: Articles in Journals
Abstract: 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
JRC Institute:Joint Research Centre Historical Collection

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