RT Journal Article SR Electronic(1) A1 Astebøl, K.YR 1994 T1 Easy-to-Use Modelling - 3D Ray Field Propagation in Open Ray Models JF , VO OP SP cp-96-00032 DO https://doi.org/10.3997/2214-4609.201407595 PB European Association of Geoscientists & Engineers, SN 2214-4609, AB , UL https://www.earthdoc.org/content/papers/10.3997/2214-4609.201407595