The Swedish Research Council (VR) has interviewed our own Annika Andersson as well as Niclas Abrahamsson, Stockholm University, about myths surrounding bilingualism. They debunk various notions, for example the idea of semi-lingualism, or the assumption that bilinguals speak neither of their two languages properly.
Find the interview (in Swedish) here:

Annika also published an article in “Förskoletidningen”, on adult’s and children’s language learning (in Swedish):  Snabbast eller bäst? Om barns och vuxnas andraspråksinlärning, see file below. Förskoletidningen, September 2017.

Snabbast eller bäst FT 4 2017