Not all articles are returned through the API

To get the weekly new and updated articles I’m iterating through categories and folders using the API:
https://<mydesk>.freshdesk.com/api/v2/solutions/categories
https://<mydesk>.freshdesk.com/api/v2/solutions/categories/$catid/folders
https://<mydesk>.freshdesk.com/api/v2/solutions/folders/$folderid/articles

So far so good - I’m getting SOME of the articles but it seems that if there are articles that have been created a long time ago (over a year), they don’t appear in the result, even if the article just recently got updated.

Is there a trick to get ALL articles regardless of their age?

I found the solution myself.

Just for the sake of completeness if somebody stumbles over the same problem:
> By default, the number of objects returned per page is 30. This can be adjusted by adding the per_page parameter to the query string
from:
https://developers.freshdesk.com/api/#pagination