R.Elven (Lid) 1996 - Jonsell B (1996) Lectotypifications and new combinations for Flora Nordica Vol. 1 (Lycopodiaceae–Papaveraceae). Nordic Journal of Botany 16(1): 3-8. doi: 10.1111/j.1756-1051.1996.tb00210.x.
There is no corrections for Dryopteris expansa var. willeana yet.