Chapter 3 (Flight plans), and Chapter 14, Paragraph 14.1.4 (Flight information region boundaries estimates) of Regional Supplementary Procedures, Doc. 7030/4 — EUR, Part 1, Rules of the Air, Air Traffic Services and Search and Rescue, (Fourth edition — 1987, incorporating Amendment No 210).
Kapitel 3 (Flight plans) und Kapitel 14, Nummer 14.1.4 (Flight information region boundaries estimates) der Regional Supplementary Procedures, Doc. 7030/4 — EUR, Teil 1 „Rules of the Air, Air Traffic Services and Search and Rescue“, (4. Ausgabe — 1987; Änderung Nr. 210 eingefügt).