Geodesic
A generalization of the Laurent series
Matematičeskie zametki, Tome 9 (1971) no. 5, pp. 521-531 
Yu. N. Frolov. A generalization of the Laurent series. Matematičeskie zametki, Tome 9 (1971) no. 5, pp. 521-531. http://geodesic.mathdoc.fr/item/MZM_1971_9_5_a5/
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     author = {Yu. N. Frolov},
     title = {A~generalization of the {Laurent} series},
     journal = {Matemati\v{c}eskie zametki},
     pages = {521--531},
     year = {1971},
     volume = {9},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_5_a5/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A system of functions, biorthogonal to the $D$-basis introduced by M. K. Fage for a linear differential operator $D$ with analytic coefficients, is constructed. Series in the combination of the $D$-basis with this system generalize Laurent series in the same way as series in the $D$-basis generalize Taylor series.