«U n nouvel indicateur pour saisir les retournements de conjoncture», Économ ie et Statistique, 1998. ,
1989: «New indexes of coincident and leading economic indicators» in ,
«A probability model of coincident economic indicators » inLAHIRI and MOORE(sous la dir. de), L eading econom ic indicators: new approaches and forecasting m ethods , E d, 1991. ,
«A procedure for predicting reces sions with leading indicators: econometric issues and recent experience», inB usiness Cycles, Indicators and Forecasting, 1993. ,