found: Work cat.: 93-31099: Kravt︠s︡ov, I︠U︡.A. Caustics, catastrophes and wave fields, 1994(Caustic, caustics)
found: NASA(Caustics (Optics))
found: Encyc. physics (Lerner/Trigg)
found: Encyc. physics (Besançon)(Caustic surface/s)
found: McGraw-Hill dict. sci. tech.:under Caustic (Optics) (Def. A curve or surface which is tangent to the rays of an initially parallel beam after reflection or refraction in an optical system)
found: Conc. dict. physics(Caustic)
found: New dict. physics(Caustic curve (and surface))
found: Sci. cit. index. Subject index, 1989:v. 16, col. 12343, under Caustics.
found: Facts file dict. physics.
