Geodesic
The use of piecewise exponential functions in transport theory
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 23 (1983) no. 4, pp. 965-972

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A method for the numerical integration of one-dimensional radiation transport equations for lasers is proposed, based on the search for their approximate solutions as continuous piecewise exponential functions. By this method, using only a few (2–3) space points, the energy characteristics of certain types of lasers, can be found with acceptable accuracy. These lasers include, in particular, those in which the pumping is independent of the space variable and is a function of time only. 
@article{ZVMMF_1983_23_4_a19,
     author = {A. V. Kondrashenko},
     title = {The use of piecewise exponential functions in transport theory},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {965--972},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1983_23_4_a19/}
}
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A. V. Kondrashenko. The use of piecewise exponential functions in transport theory. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 23 (1983) no. 4, pp. 965-972. http://geodesic.mathdoc.fr/item/ZVMMF_1983_23_4_a19/