Geodesic
On the neighborhood of the DOTU matrices
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 2, Tome 91 (1979), pp. 171-179

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Sufficient conditions for thee representation of a DOTU matrix in the DOTU type are given. 
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     author = {Kh. N. Narzullaev},
     title = {On the neighborhood of the {DOTU} matrices},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_91_a13/}
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Kh. N. Narzullaev. On the neighborhood of the DOTU matrices. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 2, Tome 91 (1979), pp. 171-179. http://geodesic.mathdoc.fr/item/ZNSL_1979_91_a13/