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1.
Proof in Geometry With Mistakes in Geometric Proofs by Fetisov, A. I., Dubnov, Ya. S. ISBN: 9780486453545 List Price: $9.95
2.
Oshibki v geometricheskih dokazatel'stvah (Russian Edition) by YA. S. Dubnov ISBN: 9785458295475 List Price: $29.95