[1]
Calleja, J. and del Olmo, C. 1970. Determination of cement content in sea mortars and concretes: data for the up to date use of the method. Materiales de Construcción. 20, 140 (Dec. 1970), 69–85. DOI:https://doi.org/10.3989/mc.1970.v20.i140.1530.