I think I see one time a translation of this book in french "l'héritage d'Asterix" but I don't remember exactly the references.

I do actually some own rechearch obaout the helvetii and if you read my bad prose de bellum gallicum part x you see that personnaly I thinj that the lost of the Helvetii were a lot less important than that for some reason (actually it is just some axis of rechearch not fact)

- Caesar didn't take the risk to attack an adversary too big for is own troops.

- like Caesar said the Helvetii who came was Outlaw

- if the Helvetie were empty, the german or the roman should have inhabited the aurea and this didn't arrive

- if we find some kind of places burned near La Tène (like the mont Vully) actually in my knolewdge we didn't known any such places in the other part of the Helvetii.

Personnaly I think that only the verbigini with some rauraci, tiguriand tulingi who were probably outnumered in their places, migrated like the celts expend themself