1. European Convention on the International Classification of Patents for Invention of December19,1954, which came into force and was published by theSecretary General of the Council of Europe onSeptember 1, 1968.
2. Scheu, M., Veefkind, V., Verbandt, Y., Molina Galan, E., Absalom, R., and Forster, W. Mapping nanotechnology patents: The EPO approach, World Patent Information,Elsevier, theNetherlands, 2006, pp.204-211.
3. JP-NETe – A English-language search tool for Japanese unexamined patents