Question types in public libraries' digital reference service in Finland: Comparing 1999 and 2006.

Piritta Numminen Pertti Vakkari Question types in public libraries' digital reference service in Finland: Comparing 1999 and 2006. 1249-1257 2009 60 JASIST 6 http://dx.doi.org/10.1002/asi.21047 db/journals/jasis/jasis60.html#NumminenV09