Schlüter, A. and Temesvary, St.: 1958, in B. Lehnert, (ed.), ‘Electromagnetic Phenomena in Cosmical Physics’, IAU Symp.6, 263.
Schmidt, H. U.: 1964, in W. N. Ness (ed.), Symp. on ‘Physics of Solar Flares’, NASA SP-50, p. 107.
Schmidt, H. U.: 1966, in G. Barbera (ed.), Atti del Convegno sui Campi magnetici Solari e la Spettroscopia ad alta Risoluzione, Firenze, p. 233.
Schmidt, H. U.: 1968, in K. O. Kiepenheuer (ed.), ‘Structure and Development of Solar Active Regions’, IAU Symp.35, 95.
Simon, G. and Weiss, N.: 1970, Solar Phys.13, 85. Google Scholar
Sturrock, H. V. and Woodbury, E. T.: 1967, ‘Force-free Magnetic Field and Solar Filaments’ in Plasma Astrophysics, 39th Enrico Fermi School, Academic Press, New York, p. 155. Google Scholar
Weber, E. J. and Davis, L. Jr.: 1967, Astrophys. J.148, 217. Google Scholar