A process for monolithic fabrication of microlenses on integrated circuits : Z D POPOVIC (Xerox Res. Centre of Canada, Mississauga, Ont., Canada), R A SPRAGUE, G A N CONNELL Proc. SPIE — Int. Soc. Opt. Eng. (USA), vol. 898, pp. 23–25 (1988). (Miniature Optics and Lasers, Los Angeles, CA, USA, 11–12 Jan. 1988)