1. Alissandrakis, C. E. and Kundu, M. R.: 1975, Solar Phys. 41, 119.
2. Alissandrakis, C. E. and Kundu, M. R.: 1978, Ap. J.
222, 342.
3. Brown, J. C., Melrose, D. B. and Spicer, D. S.: 1979, Ap. J.
228, 592.
4. Datlowe, D. W., Elcan, M. J. and Hudson, H. S.: 1974, Solar Phys.
39, 155.
5. DeJager, C. and Kundu, M. R.: 1963, Space Research III (ed. W. Priester, North-Holland Publishing Co., Amsterdam-Holland), 836.