Original: Page 18 and footnote 35 that cites Ludwig Gelberg , The Warsaw Treaty of 1970 and the Western Boundary of Poland , at 125 -- 127 ; Jochen Abr .
Simplified: Page 18 and footnote 35 that cites Ludwig Gelberg , The Warsaw Treaty of 1970 and the Western Boundary of Poland , at 125-127 ; Jochen Abr .