TY  - RPRT
TI  - Testing questionnaires with cognitive methods: Part I, Probing questions.
AU  - Siegfried Geyer
PY  - 2003
DO  - 10.1007/s00038-003-3007-5
UR  - https://pubmed.ncbi.nlm.nih.gov/12841085/
ID  - 12841085
ER  -