Note with Attachment, A.P. Ershov->V. V. Grushetsky, 24.02.1976-19.08.1978 Covering note for the handwritten Russian draft of the paper and this draft itself.
Sketch of Appendices, 09.08.1976-20.08.1976to the paper (experimental phase).
Ultimate Draft, 15.04.1977of the paper (Chapter 3).
Sketches, 06.08.1977to the oral presentation of the paper.
Manuscript, 09.08.1977of the oral presentation of the paper.
Preliminary Drafts, 10.09.1977-31.01.1977of the paper. Handwritten and typewritten texts; an appendix to the paper.
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