SPIE Proceedings [SPIE SPIE Proceedings - (Sunday 12 February 2012)] - <title>Ultragram: a generalized holographic stereogram</title>Halle, Michael W.; Benton, Stephen A.; Klug, Michael A.; Underkoffler, John S.; Benton, Stephen A. · 2012

SPIE Proceedings [SPIE EI 92 - San Jose, CA (Monday 9 March 1992)] Practical Holography VI - <title>Full-color ultragrams</title>Klug, Michael A.; Halle, Michael W.; Hubel, Paul M.; Benton, Stephen A. · 1992

SPIE Proceedings [SPIE IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology - San Jose, CA (Sunday 31 January 1993)] Practical Holography VII: Imaging and Materials - <title>Compact prototype one-step Ultragram printer</title>Klug, Michael A.; Halle, Michael W.; Lucente, Mark E.; Plesniak, Wendy J.; Benton, Stephen A. · 1993