Tscheulin, T., Petanidou, T. 2013. The presence of the invasive plant Solanum elaeagnifolium deters honeybees and increases pollen limitation in the native co-flowering species Glaucium flavum. Biological Invasions, 15(2), pp. 385-393.
http://link.springer.com/article/10.1007%2Fs10530-012-0293-y?LI=true#page-1