[1] A. L. Dulmage, N. S. Mendelsohn: The exponent of a primitive matrix. Canad. math. Bull 5 (1962), 241-244. DOI 10.4153/CMB-1962-023-2 | MR 0142566 | Zbl 0108.01203

[2] B. R. Heap, M. S. Lynn: The structure of powers of non-negative matrices I. The index of convergence. SIAM J. of Appl. Math. 14 (1966), 610-639. DOI 10.1137/0114052 | MR 0225671

[3] B. R. Heap, M. S. Lynn: The structure of powers of non-negative matrices II. The index of maximum density. Ibidem 14 (1966), 762-777. MR 0225672

[4] B. R. Heap, M. S. Lynn: The index of primitivity of a non-negative matrix. Numer. Math. 6 (1964), 120-141. DOI 10.1007/BF01386062 | MR 0163921 | Zbl 0121.26303

[5] Ю. И. Любич: Оценки для оптимальной детерминизации недетерминированных автономных автоматов. Сибирский мат. ж. 5 (1964), 337-355. MR 0162725 | Zbl 1117.65300

[6] Š. Schwarz: A semigroup treatment of some theorems on non-negative matrices. Czech. math. J. 15 (1965), 212-229. MR 0175919 | Zbl 0232.20139

[7] Š. Schwarz: A new approach to some problems in the theory of non-negative matrices. Czech. math. J. 16 (1966), 274-284. MR 0201452 | Zbl 0232.20140

[8] Š. Schwarz: Some estimates in the theory of non-negative matrices. Czech. math. J. 17 (1967), 399-407. MR 0217101 | Zbl 0159.32603

[9] Š. Schwarz: On the semigroup of binary relations on a finite set. Czech. math. J. 20 (1970), 632-679. MR 0296190 | Zbl 0228.20034

[10] H. Wielandt: Unzerlegbare, nicht-negative Matrizen. Math. Z. 52 (1950), 575-583. DOI 10.1007/BF02230720 | MR 0035265 | Zbl 0035.29101