1. British Meteorological Office 1962 Monthly Ice Charts. et seq
2. Danish Meteorological Institute Charlottenlund 1900 The state of the ice in the Arctic Seas et seq
3. 1945 See reference under Koch pp. 236–241.
4. 1945 ‘The east Greenland ice,’ Meddelelser O.M. Gronland B D 130 No. 3. Kobenhavn.
5. FREQUENCY OF WEATHER TYPES