%0 Journal Article %A Graham M. Reeve %A Vladimir M. Zakalyukin %T Singularities of the affine chord envelope for two surfaces in four-space %J Informatics and Automation %D 2012 %P 230-242 %V 277 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_2012_277_a15/ %G en %F TRSPY_2012_277_a15