@article {1992, title = {Guibert de Tournai ({\textdagger} 1284): Sermon aux chanoines r{\'e}guliers: Considerata lilia agri quomodo crescunt (Math. VI, 28)}, journal = {Revue Mabillon}, volume = {64}, year = {1992}, pages = {103-115}, author = {Long{\`e}re, Jean} }