Geodesic
A certain global property of matrix-valued functions that depend on several variables
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 5 
B. V. Verbitskii. A certain global property of matrix-valued functions that depend on several variables. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 5. http://geodesic.mathdoc.fr/item/RM_1973_28_5_a12/
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     title = {A certain global property of matrix-valued functions that depend on several variables},
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     url = {http://geodesic.mathdoc.fr/item/RM_1973_28_5_a12/}
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[1] W. Wasow, “On holomorphically similar matrices”, J. Math. Anal. Appl., 4:2 (1962), 202–206 | DOI | MR | Zbl

[2] P. F. Hsieh, Y. Sibuya, “A global analysis of matrices of functions of several variables”, J. Math. Anal. Appl., 14:2 (1966), 332–340 | DOI | MR | Zbl