J. Allen and C. Oppenheim, The overlap of US and Canadian patent literature with journal literature, World Patent Information1 (1979 ) 77-80.
2.
J. Allen andC. Oppenheim, Retrieval of product information from patent specifications, J. Chartered Institute of Patent Agents10 (1980) 60-67.
3.
B.K. Demidovicz and C. Oppenheim, The overlap of patent and journal literature in the field of animal feedstuffs, World Patent Information3 (1981) 82-83.
4.
H. East, Introduction, J.InformationSci.5 ( 1982) 97-98.
5.
F. Liebesny, Mainly on Patents (Butterworth, London, 1972).
6.
C. Oppenheim , Patents as a source of metallurgical information , The Metallurgist and Materials Technologist4 (1982) 156-158.
7.
W. Rybczynski et al., Low-cost technology options for sanitation: state of the literature, J. Information Sci.5 (1982) 98-101.
