N. A. Bazhenov, M. Mustafa, S. S. Ospichev, “On universal pairs in the Ershov hierarchy”, Sibirsk. Mat. Zh., 62:1 (2021), 31–41; Siberian Math. J., 62:1 (2021), 23–31
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N. A. Bazhenov, M. Mustafa, S. S. Ospichev, M. M. Yamaleev, “Numberings in the analytical hierarchy”, Algebra Logika, 59:5 (2020), 594–599; Algebra and Logic, 59:5 (2020), 404–407
S. Goncharov, S. Ospichev, D. Ponomaryov, D. Sviridenko, “The expressiveness of looping terms in the semantic programming”, Sib. Èlektron. Mat. Izv., 17 (2020), 380–394
S. S. Ospichev, “Computable families of sets in Ershov hierarchy without principal numberings”, Vestn. Novosib. Gos. Univ., Ser. Mat. Mekh. Inform., 15:1 (2015), 54–62; J. Math. Sci., 215:4 (2016), 529–536
S. S. Ospichev, “Infinite family of $\Sigma_a^{-1}$-Sets with only One Computable Numbering”, Vestn. Novosib. Gos. Univ., Ser. Mat. Mekh. Inform., 11:2 (2011), 89–92; J. Math. Sci., 188:4 (2013), 449–451
S. S. Ospichev, “Some Properties of Numberings in Various Levels in Ershov's Hierarchy”, Vestn. Novosib. Gos. Univ., Ser. Mat. Mekh. Inform., 10:4 (2010), 125–132; J. Math. Sci., 188:4 (2013), 441–448
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