1. Piping handbook;Reno,1973
2. Limit loads for pipe elbows with internal pressure under in-plane closing moments;Shalaby;J Press Vessels Technol,1998
3. Limit load for elbows under in-plane bending;Spence,1973
4. Limit analysis of curved tubes;Calladine;J Mech Sci,1974
5. Lower bound limit analysis of curved tubes loaded by combined internal pressure and in-plane bending moment;Goodall,1978