Volume Models for Volumetric Data. - Vishwa Ranjan; Alain Fournier (Computer, 1994)

Union of Spheres (UoS) Model for Volumetric Data. - Vishwa Ranjan; Alain Fournier (SCG, 1995)

Matching and Interpolation of Shapes using Unions of Circles. - Vishwa Ranjan; Alain Fournier (Comput. Graph. Forum, 1996)

Creating Union of Spheres Models from Multiple Views. - Vishwa Ranjan; Alain Fournier (J. Graphics, GPU, & Game Tools, 1996)