Arellano, F. (2000). Subject searching in online catalogs including Spanish and
English material
. Cataloging and-Classification Quarterly, 28 (2), 45-56.
Retrieved September, 12, 2009, from:
http://www.informaworld.com/smpp/content~content=a904771544&db=all
Frost, C. (1989). Title word as entry vocabulary to LCSH: Correlation between
assigned LCSH term and derived terms from title. Cataloging & Classification
Quarterly, 10 (1,2), 165-179.
Gil-Leiva, I.
& Alonso-Arroyo, A. (2007). Keywords Given by Authors of Scientific
Articles in Database Descriptors
. Journal of the American Society for
Information Science and Technology, 58 (8), 1175–1187. Retrieved October,
10, 2009, from: http://www3.interscience.wiley.com/cgibin/fulltext/28005/PDFSTART
Gil-Leiva, I.
& Rodríguez Muñoz, J.V. (1997). Análisis de los descriptors de
diferentes áreas del conocimiento indizadas en bases de datos del CSIC.
Aplicación a la indización automática [Descriptors analysis on different
knowledge areas in CSIC databases. Application on automatic indexing].
Revista Española de Documentación Científica, 20 (2), 150–161. Retrieved 

January, 8, 2009, from: http://sciencelinks.jp/j- st/article/200203/0000 200203
02 A 0116 54.php
Henzler, R. G. (1978). Free or controlled vocabularies: some statistical user-oriented
evaluations of biomedical information systems. International Classification,
5
(21, 26), 21-26.
Mark, T. & Tarullo, H. (2003). Technology and the transformation of abstracting
and indexing services. Serials Review, 29 (3), 213-220.
Muddamalle, M.R. (1998). Natural language versus controlled vocabulary in
information retrieval: a case study in soil mechanics. Journal of American
Society for Information Science, 49 (10), 881-887. Retrieved marc, 10, 2009,
from:
http://www.informaworld.com/smpp/content~content=a904771544&db=all
Peters, T.A. & Kurth, M. (1991). Controlled and uncontrolled vocabulary subject
searching in an academic library catalog. Information Technology and
Libraries, 10 (3), 201-211. Retrieved October, 15,2009, from:
http://www.informaworld.com/smpp
Shaw, W. M. (1994). Retrieval expectations, cluster-based effectiveness, and
performance standards in the CF database. Information Processing and
Management : an International Journal, 30 (5), 11- 723. Retrieved February,
15, 2009, from: http://portal.acm.org/citation.cfm?id=185797.185814
Shepherd, M.; Phillips, A. & Lui, W. J. (1983). Overlap of title keyword and
Assigned Descriptors in the OON Database. Canadian Journal of Information
Service, 12 (1), 58-66. Retrieved July, 12, 2009, from: http://proquest.umi.com
Voorbij, H. (1998). Title keywords and subject descriptors: a comparison of subject
search entries of books in the humanities and social sciences. Journal of
Documentation, 54 (4), 466-476. Retrieved july, 8, 2009, from:
http://www.emeraldinsight.com/Insight/advancedSearc