I haven't written an article in English myself, but here is a link to the Houston Hawks thermal page.

Three articles on thermals - one - two - three

Yorksoaring about thermals

Paragliding thermals

Paraglide cross country thermal advice - one - two - three

Links to tips on thermals (paragliding)

A thermal quizz

A colorfull themal simulation with movies

American bald eagle in themals

Teaching thermals

How to see thermals