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A PechaKucha teaching talk summarizing this synthesis on interactions: Chamberlain, S. A., Bronstein, J. L. and Rudgers, J. A. 2014. How context dependent are species interactions? - Ecology Letters 17: 881-890.
Additional source: Armas, C., Ordiales, R. and Pugnaire, F. 2004. Measuring plant interactions: a new comparative index. - Ecology 85: 2682-2686.