Representation and Display of Vector Field Topology in Fluid Flow Data Sets. - James Helman; Lambertus Hesselink (Computer, 1989)

Surface Representations of Two- and Three-Dimensional Fluid Flow Topology. - James Helman; Lambertus Hesselink (IEEE Visualization, 1990)

Visualizing vector field topology in fluid flows. - James Helman; Lambertus Hesselink (IEEE Computer Graphics and Applications, 1991)

IRIS performer: a high performance multiprocessing toolkit for real-time 3D graphics. - John Rohlf; James Helman (SIGGRAPH, 1994)