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On reducibility of partial recursive functions. Degtev, A.N., Sakunova, E.S. (2000) Siberian Mathematical Journal
On resemblance and recursive isomorphism types of bounded partial recursive functions. Litvinov, N.V. (2000) Siberian Mathematical Journal
On resemblance and recursive isomorphism types of partial recursive functions. Polyakov, E.A. (2001) Siberian Mathematical Journal
On the lengths of bad sequences of monomial ideals over polynomial rings Florian Pelupessy, Andreas Weiermann (2012) Fundamenta Mathematicae We give bad (with respect to the reverse inclusion ordering) sequences of monomial ideals in two variables with Ackermannian lengths and extend this to multiple recursive lengths for more variables.
On the reducibility of the index sets of families of general recursive functions. Ю.Д. Корольков (1982) Sibirskij matematiceskij zurnal
On the resemblance and recursive isomorphism types of partial recursive functions. Litvinov, N.V. (2000) Siberian Mathematical Journal