Theoretical A 1A‘2–X 1A1 absorption and emission spectrum of ammonia - Rosmus, P.; Botschwina, P.; Werner, H.-J.; Vaida, V.; Engelking, P. C.; McCarthy, M. I. (American Institute of Physics (AIP), 1987)
http://dx.doi.org/10.1063/1.452416
Keywords: U; V