Regular linear systems on CP 1 and their monodromy groups
Complex analytic methods in dynamical systems - IMPA, January 1992, Astérisque, no. 222 (1994), pp. 259-283. 
@incollection{AST_1994__222__259_0,
     author = {Kostov, V. P.},
     title = {Regular linear systems on $CP^1$ and their monodromy groups},
     booktitle = {Complex analytic methods in dynamical systems - IMPA, January 1992},
     editor = {Camacho C. and Lins Neto A. and Moussu R. and Sad P.},
     series = {Ast\'erisque},
     pages = {259--283},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {222},
     year = {1994},
     language = {en},
     url = {http://www.numdam.org/item/AST_1994__222__259_0/}
}
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%E Lins Neto A.
%E Moussu R.
%E Sad P.
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Kostov, V. P. Regular linear systems on $CP^1$ and their monodromy groups, dans Complex analytic methods in dynamical systems - IMPA, January 1992, Astérisque, no. 222 (1994), pp. 259-283. http://www.numdam.org/item/AST_1994__222__259_0/

1. W. R. Wasow, Asymptotic expansions for ordinary differential equations. Huntington, New York, Krieger, 1976.

2. F. R. Gantmacher, The theory of matrices, vol. 1-2, New York, Chelsea Publ., Co., 1959.