This article was published in December 2016 in the Acta Ornithologica journal.
It deals with the interactions between Mute Swans and other waterbirds in fishponds.
You can access it on its publisher’s website, as well as its abstract, through the opposite link.
Photo: Mute Swans by Henk Monster, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=53959951