11.   The researchers overcame technical difficulties that had hindered prior attempts, he said.

12.   Experts said this has hindered attempts to create a common market since free trade movement is an essential step.

13.   Fear of landmines was hindering attempts by rescue teams to survey some villages.

14.   Koschnik charged in Bonn Friday that the Croats were hindering his attempts to reunify the town and persuade refugees to return.