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