Serving the Numerical Simulation community since 1989 
Isoparametric mapping introduced
I. Ergatoudis, B. M. Irons and O. C. Zienkiewicz introduced “isoparametric’ mapping for quadrilateral elements. This implied that for a given element, the basis functions used for displacements are the same as the basis functions used for mappings.
Ergatoudis, I., Irons, B. M., and Zienkiewicz, O. C. (1968). Curved, isoparametric,“quadrilateral” elements for finite element analysis. International Journal of Solids and Structures, 4(1), 31-42.
