Helander, P. Stellarator Theory (ST), Max Planck Institute for Plasma Physics, Max Planck Society;
https://doi.org/10.1017/S002237782100129X (Publisher version)
Helander, P., Hudson, S. R., & Paul, E. J. (2022). On heat conduction in an irregular magnetic field. Part 1. Journal of Plasma Physics, 88(1): 905880122. doi:10.1017/S002237782100129X.