1. Bloor M I G and Vilson M J ‘Generating blend surfaces using Partial Differential Eqautions’, CAD, to appear April 1989.
2. Woodwark, J R ‘Blends in Geometric Modelling’, The Mathematics of Surfaces II, ed. Martin, R R, Oxford, UK,(1987).
3. Hoffmann C and Hopcroft J ‘The Potential Method for Blending Surfaces’, Geometric Modelling: Algorithms & New Trends, Farin, G, SIAM, Philadelphia, USA, (1987) pp 347–364