=SI(B$3=0;"";
SIERREUR(INDEX(greg!$A$3:$O$20;EQUIV(1;(greg!$B$3:$B$20<=B$5)*(greg!$C$3:$C$20>=B$5)*(greg!$A$3:$A$20=$A6);0);6);"")&
SIERREUR(INDEX(greg!$A$3:$O$20;EQUIV(1;(greg!$G$3:$G$20<=B$5)*(greg!$H$3:$H$20>=B$5)*(greg!$A$3:$A$20=$A6);0);11);"")&
SIERREUR(INDEX(greg!$A$3:$O$20;EQUIV(1;(greg!$L$3:$L$20<=B$5)*(greg!$M$3:$M$20>=B$5)*(greg!$A$3:$A$20=$A6);0);15);""))