count_author_gnd_refs: Only count distinct references (1 per record), not total references, see ubtue/tuefind#1019
count_author_gnd_refs: Only count distinct references (1 per record), not total references, see ubtue/tuefind#1019

ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools