Geodesic
On influence of the arbitrary parameters in the Gaussian beam method
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 15, Tome 148 (1985), pp. 116-119

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The influence of the arbitrary parameters in the Gaussian beam method is discussed. An example of exact solvable problem shows the possibility to extend the domain of validity of the method by means of appropriate choice of these parameters. 
@article{ZNSL_1985_148_a11,
     author = {A. I. Lanin and M. M. Popov},
     title = {On influence of the arbitrary parameters in the {Gaussian} beam method},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {116--119},
     publisher = {mathdoc},
     volume = {148},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_148_a11/}
}
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A. I. Lanin; M. M. Popov. On influence of the arbitrary parameters in the Gaussian beam method. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 15, Tome 148 (1985), pp. 116-119. http://geodesic.mathdoc.fr/item/ZNSL_1985_148_a11/