activity described in <a href="https://en.wikipedia.org/wiki/b:Interlingual_Energizers" class="extiw" title="en:b:Interlingual Energizers">Interlingual Energizers</a>
Cantoreanu Vlad Vasile
CC BY-SA 4.0
workshop on <a href="https://en.wikipedia.org/wiki/b:Interlingual_Energizers" class="extiw" title="en:b:Interlingual Energizers">Interlingual Energizers</a> on 25 June 2016