TY  - BOOK
AU  - Douma,Jochem
AU  - Velema,W.H.
TI  - Polio: afwachten of afweren? 
SN  - 9070057697
U1  - 241.642 @
PY  - 1979///
CY  - Amsterdam
PB  - Bolland
KW  - Poliomyelitis
KW  - Vaccination
N1  - Bibliografie
ER  -