D. Williamson, R. Kestner, J. Daniel, and D. Bajuk, "Aspheres in microlithography,"
in Fabrication and Testing of Aspheres, J. Taylor, M. Piscotty, and A. Lindquist, eds.,
Vol. 24 of OSA Trends in Optics and Photonics
(Optical Society of America, 1999), paper DS2.