TY  - GEN
T1  - The case for the invisible copies /
AU  - Keplinger, Michael S.,
VL  - 1970 No 66 Oct pages 3-31
ID  - 9629
KW  - Copyright.
KW  - COPYRIGHT : RIGHT OF REPRODUCTION AND ADAPTATION : ELECTRONIC OR OTHER MEANS, SAMPLING
TI  - The case for the invisible copies /
ER  -