Ibis, 1991 Staff Author(s) Citation Greenwood, J.J.D. & Baillie, S.R. 1991. Effects of density-dependence and weather on population changes of English passerines using a non-experimental paradigm. Ibis 133: 133. doi:10.1111/j.1474-919X.1991.tb07675.x Staff author(s) Stephen Baillie