References to articles on or related to Chordal Propagation.

Investigations on Great-Circle Propagation between Eastern Australia and
Western Europe. - Hans Albrecht. - Publication "Geofis. p. eappl." - 1957
Pages 169 to 180.

The Roll of Ionospheric - Layer Tilts in Long Range High - Frequency Radio
Propagation. - Sydney Stein. "Journal of Geophysical Research." - March
1958 - Pages 217 to 241.

Propagation Studies on 3.5 and 7 Mc. -  Hans Albrecht. - "Amateur Radio
(Australia)." - April 1958 -  Pages 2 and 3.

Low Angle Radiation. - L A Moxon "Wireless World" April 1970. - Pages
155 to 158.

The Influence of Chordal Paths on Signals to the Near Antipode of an HF
Radio Transmitter. - Gary E J Bold - "IEEE Transactions on Antennas and
Propagation." Volume AP-20, No 6, November 1972 - Pages 741 to 746.

The 160 Metre Band. An Enigma Shrouded in Mystery. Parts I and II. - Cary
Older and Dr. Theodore J Cohen, N4XX. "CQ"  - March and April 1998. Pages
9 to 14 and 11 to 16 respectively.