1. Seismic design requirements in a Mexican 1976 code
2. New Zealand Standard NZS 4203: 1976, ‘Code of practice for general structural design and design loadings for buildings’.
3. National Building Code of Canada, 1977, Subsection 4.1.9.1.
4. Tentative Provisions for the Development of Seismic Regulations for Buildings, ATC 3–06, Applied Technology Council, June, (1978).
5. DIN 4149, Bauten in deutschen Erdbebengebieten Entwurf, December, (1976).