Institution: | 1. Building Research Establishment, Princes Risborough Laboratory, Princes Risborough, Aylesbury, Buckinghamshire, UK;2. Rhône Poulenc, Laboratorie Central, Chimie de Bave, 38800 Le Pont de Claix, France;3. Dynamit Nobel AG, Werk Reinfelden, D-7888 Reinfelden/Baden, Federal Republic of Germany |