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   @article{cam85,
    title     = {An Efficient Numerical Solution Technique for Wave Propagation in Horizontally
                Stratified Environments},
    author    = {Henrik Schmidt and F. B. Jensen},
    journal   = {Comp. and Maths with Appls},
    pages     = {699--715},
    volume    = {11},
    year      = {1985}}