J/A+A/313/1008 Slender flux tubes variational principle . I. (Achterberg 1996) [DIR] Parent Directory [ ] ReadMe 07-Oct-1996 15:23 1.6K [ ] appen.ps.gz 31-Jul-2001 15:33 35K [ ] appen.tex.gz 23-May-1996 16:58 7.9K