TY  - RPRT
TI  - An improved volumetric impinger for pollen counting.
AU  - H P MARX
AU  - J SPIEGELMAN
AU  - G I BLUMSTEIN
DO  - 10.1016/0021-8707(59)90061-9
UR  - https://pubmed.ncbi.nlm.nih.gov/13620448/
ID  - 13620448
ER  -