TY  - RPRT
TI  - Nursing research: obstacles and challenges. 1976.
AU  - I M Martinson
PY  - 1997
DO  - 10.1111/j.1547-5069.1997.tb01044.x
UR  - https://pubmed.ncbi.nlm.nih.gov/9433002/
ID  - 9433002
ER  -