Mark DURING Sweep rather than Mark THEN Sweep.

Christian Queinnec Barbara Beaudoing Jean-Pierre Queille Mark DURING Sweep rather than Mark THEN Sweep. 224-237 1989 conf/parle/1989-1 PARLE (1) db/conf/parle/parle89-1.html#QueinnecBQ89 http://dx.doi.org/10.1007/3540512845_42