1L D Mitchell. A Perspective View of Modal Analysis. Proc 6^th IMAC,1988.
2Rajit Gadh, Ratnakar Sonthi. Geometric shape abstractions for internet- based virtual prototyping. Computer - Aided Design, Vol. 30, No. 6, pp. 473-486, 1998.
3J Whyte , N Bouchlagheml, A Thorpe, R McCaffer. From CAD to virtual reality: modelling approaches, data exchange and interactive 3D building design tools. Automation in Construction 2000(10) :43 - 55.
