1. Watts, G.W. andH.A. Lang: The stresses in a pressure vessel with a flat head closure. Trans. ASME Vol. 74 (1952) pp. 1083/91.
2. Watts, G.W., andH.A. Lang: The stresses in a pressure vessel with a conical head. Trans. ASME Vol. 74 (1952) pp. 315/26.
3. Watts, G.W., andH.A. Lang: The stresses in a pressure vessel with a hemispherical head. Trans. ASME Vol. 75 (1953) pp. 83/89.
4. Krans, H., G.G. Bilodeau andB.F. Langer: Stresses in thin-walled pressure vessels with ellipsoidal heads. J. Engng. for Industry Vol. 83, Ser. B (1961) No. 1, pp. 29/42.
5. Galletly, G.D., andJ.R. Radok: On the accuracy of some shell solutions. Trans., ASME, Ser. E. Vol. 21 (1959).