Geodesic
On the question of complete positivity of powers of matrices
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1978), pp. 124-126.

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@article{IVM_1978_5_a14,
     author = {I. S. Shevchuk},
     title = {On the question of complete positivity of powers of matrices},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {124--126},
     publisher = {mathdoc},
     number = {5},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1978_5_a14/}
}
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I. S. Shevchuk. On the question of complete positivity of powers of matrices. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1978), pp. 124-126. http://geodesic.mathdoc.fr/item/IVM_1978_5_a14/