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  • 1 Library of the Hungarian Academy of Sciences Information Science and Scientometrics Research Unit (ISSRU) P.O. Box 7 H-1361 Budapest Hungary P.O. Box 7 H-1361 Budapest Hungary
  • 2 Institute of Scientific and Technical Information and Documentation (CSIC) Calle Joaquin Costa 22 28002 Madrid Spain Calle Joaquin Costa 22 28002 Madrid Spain
  • 3 Institut d'Estudis Avancats (CSIC-UIB) Cra. de Valldemossa, km 7,5 07071 Palma de Mallorca Spain Cra. de Valldemossa, km 7,5 07071 Palma de Mallorca Spain
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