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R. Cordes, Is grey literature ever used? Using citation analysis to measure the impact of GESAMP, an international marine scientific advisory body, Canadian Journal of Information and Library Science, vol.27, issue.3, pp.109-127, 2002.

D. Cesare and R. , The evaluation of GL impact in Physical sciences using bibliometric indicators: preliminary results. -In: GL'93 Conference Proceedings: The First International Conference on Grey LiteratureWeinberg Report 2000" held in Amsterdam, The Netherlands, 13-15 December 1993 at the RAI Congress Centre. - Amsterdam : GreyNet/TransAtlantic, GL-conference series, pp.64-76, 1994.

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D. Cesare, R. , and C. Sala, The use of grey literature in the agricultural economics field: a quantitative analysis. -In: GL'95 Conference Proceedings: The Second International Conference on Grey Literature "Grey Exploitations in the 21st Century, 2-3 November 1995 at the Catholic University of America. -Amsterdam : GreyNet/TransAtlantic, GL-conference series, pp.157-168, 1996.

D. G. Heij, J. Van-de, I. R. Van-der-burg, M. Cressie, and . Wedel, Comparative analysis of the penetrative capacity of synopses and of full papers unrelated to the synopses published in the same broad-scope agricultural journal, Journal of Information Science, vol.16, issue.3, pp.155-164, 1990.
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L. Osaniyi, IITA conducts study on the use of grey literature, Quarterly Bulletin of the International Association of Agricultural Information Specialists, vol.41, issue.3, pp.263-264, 1996.

B. A. Osif, International Transportation Literature: An Analysis of Citation Patterns, Availability and Research Implications for the Transportation Community. - In: GL'99 Conference Proceedings : The Fourth International Conference on Grey Literature "New Frontiers in Grey Literature, Washington D.C., 4-5 October 1999 at the Kellogg Conference Center. -Amsterdam : GreyNet/MCB UPGL-conference series, pp.47-60, 2000.

Y. M. Patil and P. S. Kumar, Grey literature in Pedology : how grey is it? -In: International Information Communication & Education, pp.171-181, 1997.

Y. M. Patil and P. S. Kumar, Pedological literature analysis. -In: Library Science with a Slant to Documentation and Information Studies, pp.125-132, 1998.

T. E. Pinelli and V. L. Golich, The Reader Preferences of NASA Technical Reports in Electronic Format: Results of a Survey, GL'97 Conference Proceedings : The Third International Conference on Grey Literature "Perspectives on the Design and Transfer of Scientific and Technical Information at the Jean Monnet Building, pp.13-14, 1997.

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T. Ramadevi and A. Takalkar, Use Pattern of Grey Literature in Rural Development : An Indian case study. -In: GL'99 Conference Proceedings : The Fourth International Conference on Grey LiteratureNew Frontiers in Grey Literature, 4-5 October 1999 at the Kellogg Conference Center. - Amsterdam : GreyNet, GL-conference series, pp.260-275, 2000.

A. N. Vinogradov and L. M. Kabdulova, Grey literature as a main source of information about modern Russian knowledge on the Arctic Region development. -In: Proceedings of the 15th Polar Libraries Colloquy, Bipolar information initiatives : the needs of polar research. Cambridge, 3-8, pp.98-100, 1994.

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M. Thelwall and D. J. Farace, 413-420 SOURCES USED FOR THE DATA COLLECTION 30 -Grey Literature Network Service. -Amsterdam : GreyNet/TransAtlantic, GL'93 Conference Proceedings : First International Conference on Grey Literature cm. -Index. -(GL-conference series Conference proceedings, pp.13-15, 1993.

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