Djärv, K., J. Zehr, and F. Schwarz. “Cognitive Vs. Emotive Factives: An Experimental Differentiation”. Proceedings of Sinn Und Bedeutung, Vol. 21, no. 1, 1, pp. 367-86, https://ojs.ub.uni-konstanz.de/sub/index.php/sub/article/view/143.