TY  - RPRT
TI  - The "invisible" can top.
AU  - R K Levick
AU  - L Spitz
PY  - 1977
DO  - 10.1259/0007-1285-50-596-594
UR  - https://pubmed.ncbi.nlm.nih.gov/890237/
ID  - 890237
ER  -