TY  - BOOK
AU  - British Standards Institution
TI  - BS-4432 (Part 4) - 1980/ISO 3688 - 1977; Methods for determining optical properties of pulp, paper and board Part 4 measurement of diffuse blue reflectance factors (ISO brightness) of pulps
PY  - 1980///
CY  - London
PB  - BSI
ER  -