www.ludoteka.com : A nice site for playing Unlur and other board and card games in real time with real opponents
Abstract Games Magazine: Unlur is covered here among other brainy games.
Unlur page in french by Elvire Scheibling.
The world of Abstract Games by Joao Neto. He is also the author of the javascript tool used here for printing the diagrams.
Gamedit An Unlur editor by Pascal "Skal" Grossé.