TY  - RPRT
TI  - The factorial survey: an experimental method to replicate real world problems.
AU  - R Ludwick
AU  - R A Zeller
DO  - 10.1097/00006199-200103000-00009
UR  - https://pubmed.ncbi.nlm.nih.gov/11302293/
ID  - 11302293
ER  -