1. and 26th Ann. Tech. Conf. Reinforced Plastics/Composites Institute, SPI, Paper 12-F (1971).
2. and 32nd Ann. Tech. Conf., Reinforced Plastics/Composites Institute, SPI, Paper 7-D (1977).
3. and 37th Ann. Tech. Conf., Reinforced Plastics/Composites Institute, SPI, Paper 7-C (1982).
4. and 37th Ann. Tech. Conf., Reinforced Plastics/Composites Institute, SPI, Paper 7-D (1982).