Geodesic
Isolation theorems for DOTU matrices
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 4, Tome 112 (1981), pp. 159-166

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One presents the proof of a theorem which gives the possibility to “isolate” DOTU matrices and allows us to use computers in the investigation of DOTU matrices of small size. 
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     author = {Kh. N. Narzullaev},
     title = {Isolation theorems for {DOTU} matrices},
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     year = {1981},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_112_a11/}
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Kh. N. Narzullaev. Isolation theorems for DOTU matrices. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 4, Tome 112 (1981), pp. 159-166. http://geodesic.mathdoc.fr/item/ZNSL_1981_112_a11/