1. Bianco, L., 1992. Pulverized fuel ash in pumped concrete. B.E.&A. Project Report, University of Malta.
2. Radon and health – a review;Bowie;Lancet,1991
3. British Standard Institution. BS 812-2, 1995. Testing of Aggregates. Methods for determination of density.
4. British Standard Institution. BS 812-103.1, 1985. Testing of aggregates. Method for determination of particle size distribution. Sieve tests.
5. British Standard Institution. BS EN 1097-5, 1999. Tests for mechanical and physical properties of aggregates; Determination of water content by drying in a ventilated oven.