Letter, V. Bityutskov->A.P. Ershov, 11.04.1978
Letter, V. Bityutskov->A.P. Ershov..., 31.03.1977
Letter, V. Bityutskov->A.P. Ershov, 28.09.1981Request to proof-read the "LISP" article
Letter, A.P. Ershov->V. Bityutskov, 25.10.1982Sending the promised article and explaining why its size is greater then initially agreed (handwritten and typewritten copies)
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