The search engine requires that a string is entered at least in the first line.

In each line strings separated with a blank will be regarded as AND-connected in the search. If you really want blanks to be taken into account enter "_" instead (e.g. de_Boer).

If in an AND-connected search not all strings should appear highlighted in the entry this is due to the fact that only a part of the data in the database is displayed.

If books should be listed more than once this is due to a wrong entry in the database ALLEGRO. This will be corrected.