rlm@426: @incollection {Tappert77,
rlm@426: AUTHOR = {Tappert, Fred D.},
rlm@426: TITLE = {The parabolic approximation method},
rlm@426: BOOKTITLE = {Wave propagation and underwater acoustics ({W}orkshop,
rlm@426:               {M}ystic, {C}onn., 1974)},
rlm@426: PAGES = {224--287. Lecture Notes in Phys., Vol. 70},
rlm@426: PUBLISHER = {Springer},
rlm@426: ADDRESS = {Berlin},
rlm@426: YEAR = {1977},
rlm@426: MRCLASS = {76.41 (86.41)},
rlm@426: }