Ecological Flora of the Shropshire Region. Streeter, D. T. ; Sinker, C. A. ; Packham, J. R. ; Trueman, I. C. ; Oswald, P. H. ; Perring, F. H. ; Prestwood, W. V. Abstract Publication: Journal of Ecology Pub Date: June 1986 DOI: 10.2307/2260293 Bibcode: 1986JEcol..74..614S