TY  - RPRT
TI  - Current cases & concepts.
AU  - G R Syvertsen
AU  - J R Haaga
PY  - 1979
DO  - 10.1016/0149-936x(79)90055-9
UR  - https://pubmed.ncbi.nlm.nih.gov/262207/
ID  - 262207
ER  -