Xu, B.; Yekta, A.; Li, L.; Masoumi, Z.; Winnik*, M. A. The Functionality Of Associative Polymer Networks: The Association Behavior Of Hydrophobically Modified Urethane-Ethoxylate (Heur) Associative Polymers In Aqueous Solution. Colloids and Surfaces, A: Physicochemical and Eng. Aspects. 1996, 112, 239?250.