1. ‘Preliminary European Recommendations for Sandwich Panels: Part 1: Design’, European Convention for Constructional Steelwork, Publication No. 66 (1991).
2. Tiainen, T. and Hiekkanan, I., ‘Service life prediction of PAROC building elements in Southern Finland climate’, Report No. 54/1991 (Tampere University of Technology Institute of Materials Science, 1991).