TY  - RPRT
TI  - Probing the unknown.
AU  - R J Post
AU  - J M Crampton
PY  - 1987
DO  - 10.1016/0169-4758(87)90251-1
UR  - https://pubmed.ncbi.nlm.nih.gov/15462900/
ID  - 15462900
ER  -