TY  - BOOK
AU  -  Steel,W.H.
ED  -  Australia. Common Wealth Scientific and Industrial Research Organisa tion.
TI  -  The birefringent filter / 
PY  - 1964///
CY  -  Melbourne : 
PB  -  Common Wealth Scientific and Industrial Research Orga nisation, 
KW  -  Filters (Mathematics)
N1  -  Includes bibliographical references (p. 18)
ER  -