1. Klinkenberg, L. J., ‘The permeability of porous media to liquids and gases’, in ‘Drilling and Production Practice’, (American Petroleum Institute, New York, 1941) pp. 200–214.
2. Žagar, L., ‘Die Grundlagen zur Ermittlung der Gasdurchlässigkeit von feuerfesten Baustoffen’,Arch. Eisenhüttenwesen 26 (1955) 777–782.
3. Deutsche Normen DIN 51058, ‘Testing of ceramic raw and semi-finished materials: determination of specific gas permeability of refractory bricks’ (1963).
4. Därr, G. M. and Ludwig, U., ‘Determination of permeable porosity’,Mater. Struct.: Res. Test. 6 (33) (1973) 185–190.
5. Technical Report 42.544;C. D. Lawrence,1981