%0 Journal Article %A Li, Hui %A Peng, Liang-Xue %T Pressing Down Lemma for $\lambda $-trees and its applications %J Czechoslovak Mathematical Journal %D 2013 %P 763-775 %V 63 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1007/s10587-013-0050-0/ %R 10.1007/s10587-013-0050-0 %G en %F 10_1007_s10587_013_0050_0