--- ray/doc/ray.1	2023/05/11 17:18:39	1.39
+++ ray/doc/ray.1	2023/11/03 17:41:27	1.40
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: ray.1,v 1.39 2023/05/11 17:18:39 greg Exp $"
+.\" RCSid "$Id: ray.1,v 1.40 2023/11/03 17:41:27 greg Exp $"
 .\" Print using the -ms macro package
 .DA 5/11/2023
 .LP
@@ -1595,6 +1595,14 @@ the Ecole Polytechnique Federale de Lausanne (EPFL Uni
 in Lausanne, Switzerland.
 .NH 1
 References
+.LP
+Ward, Gregory J., Bruno Bueno, David Geisler-Moroder, 
+Lars O. Grobe, Jacob C. Jonsson, Eleanor
+S. Lee, Taoning Wang, Helen Rose Wilson,
+``Daylight Simulation Workflows Incorporating
+Measured Bidirectional Scattering Distribution Functions,''
+.I "Energy & Buildings",
+Vol. 259, No. 111890, 2022.
 .LP
 Wang, Taoning, Gregory Ward, Eleanor Lee,
 ``Efficient modeling of optically-complex, non-coplanar