1. BS 1515, Fusion welded pressure vessels for use in the chemical, petroleum and allied industries,1969
2. BS 3915, Carbon and low alloy steel pressure vessels for primary circuits of nuclear reactors,1965
3. Analysis of pad reinforced spherical pressure vessel with radial branch;Kitching,1977
4. Experiments on spherical pressure vessels with pad reinforced nozzles;Gill,1977
5. The limit pressure for a flush cylindrical nozzle in a spherical pressure vessel;Gill;Int. J. mech. Sci.,1964