Citation: Dm. Willis et al., UNCERTAINTIES IN FIELD-LINE TRACING IN THE MAGNETOSPHERE .1. THE AXISYMMETRICAL PART OF THE INTERNAL GEOMAGNETIC-FIELD, Annales geophysicae, 15(2), 1997, pp. 165-180
Citation: Dm. Willis et al., UNCERTAINTIES IN FIELD-LINE TRACING IN THE MAGNETOSPHERE .2. THE COMPLETE INTERNAL GEOMAGNETIC-FIELD, Annales geophysicae, 15(2), 1997, pp. 181-196
Citation: Dm. Willis et al., AURORAL OBSERVATIONS ON AD 1770 SEPTEMBER 16 - THE EARLIEST KNOWN CONJUGATE SIGHTINGS, Quarterly Journal of the Royal Astronomical Society, 37(4), 1996, pp. 733-742
Citation: Dm. Willis et al., COMPARISON BETWEEN ORIENTAL AND OCCIDENTAL SUNSPOT OBSERVATIONS, Quarterly Journal of the Royal Astronomical Society, 37(2), 1996, pp. 189-229
Citation: Dm. Willis et al., SYNOPTIC DATA FOR SOLAR-TERRESTRIAL PHYSICS - THE UK CONTRIBUTION TO LONG-TERM MONITORING, Journal of atmospheric and terrestrial physics, 56(7), 1994, pp. 871-886