L. M. Pavlotskaya, “Turing Machines Connected to the Undecidability of the Halting Problem”, Mat. Zametki, 71:5 (2002), 732–741; Math. Notes, 71:5 (2002), 667–675
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2.
L. M. Pavlotskaya, “Solvability of the halting problem for certain classes of Turing machines”, Mat. Zametki, 13:6 (1973), 899–909; Math. Notes, 13:6 (1973), 537–541