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  Get a preprint: 11-SSRM-pcl03.pdf 
• C. Caleiro, W. A. Carnielli, J. Rasga, and C. Sernadas. Fibring of logics as a universal construction. In D. Gabbay and F. Guenthner, editors, Handbook of Philosophical Logic, 2nd Edition, volume 13, pages 123--187. Springer, 2005.
  Get a preprint: 04-CCRS-fiblog23.pdf