1. Swainger, K. H., awaiting publication.
2. Swainger, K. H., awaiting publication.
3. Timoshenko, S., âœTheory of Elasticityâ (McGraw-Hill, 1934), p. 9.
4. Weatherburn, C. E., âœAdvanced Vector Analysisâ (Bell, 1937), p. 136.
5. Swainger, K. H., Phil. Mag., vii, 36, 443 (1945).