The ECLA classification system : Dickens, D. T. World Patent Information 16(1), pp. 28–32

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 133 KB
• Volume: 16
• Category: Article
• ISSN: 0172-2190
• DOI: 10.1016/0172-2190(94)90204-6