1. Altschuler , M. D. D. E. Trotter Coronal magnetic field maps, before, during, after the period 26 July to 14 August 1972 (current free approximation) Data Reports on August 72 Solar-Terrestrial Events 74 76 Boulder, Colorado 1973
2. Bumba , V. Occurrence of the August 1972 proton-flare region in the frame of the large scale magnetic field regularities Data Reports on August 72 Solar-Terrestrial Events 77 79 Boulder, Colorado 1973
3. Correspondence of solar field sector direction and polar cap geomagnetic field changes for 1965;Campbell;J. Geophys. Res.,1973
4. Polar magnetic fields of the sun: 1960-1971;Howard;Solar Phys.,1972
5. New evidence of a relationship between magnetic fields in space and on earth;Mansurov;Geomagn. Aeron.,1969