--- ray/doc/ray.1	2011/06/22 00:13:25	1.21
+++ ray/doc/ray.1	2015/09/18 18:29:00	1.27
@@ -1,8 +1,8 @@
-.\" RCSid "$Id"
+.\" RCSid "$Id: ray.1,v 1.27 2015/09/18 18:29:00 greg Exp $"
 .\" Print using the -ms macro package
-.DA 2/17/2011
+.DA 09/18/2015
 .LP
-.tl """Copyright \(co 2011 Regents, University of California
+.tl """Copyright \(co 2015 Regents, University of California
 .sp 2
 .TL
 The
@@ -1551,6 +1551,20 @@ the Ecole Polytechnique Federale de Lausanne (EPFL Uni
 in Lausanne, Switzerland.
 .NH 1
 References
+.LP
+McNeil, A., C.J. Jonsson, D. Appelfeld, G. Ward, E.S. Lee,
+``A validation of a ray-tracing tool used to generate
+bi-directional scattering distribution functions for
+complex fenestration systems,''
+.I "Solar Energy",
+98, 404-14, November 2013.
+.LP
+Ward, G., R. Mistrick, E.S. Lee, A. McNeil, J. Jonsson,
+``Simulating the Daylight Performance of Complex Fenestration Systems
+Using Bidirectional Scattering Distribution Functions within Radiance,''
+.I "Leukos",
+7(4),
+April 2011.
 .LP
 Cater, K., A. Chalmers, G. Ward,
 ``Detail to Attention: Exploiting Visual Tasks for Selective Rendering,''