Patrick Blackburn and
Maarten de Rijke. Why Combine Logics? In Studia Logica. An International Journal for Symbolic Logic, Vol. 59(1):5-27, 1997. Note: but published later.
@Article{Blackburn_de Rijke:1997,
AUTHOR = {Blackburn, Patrick and de Rijke, Maarten},
TITLE = {Why Combine Logics?},
YEAR = {1997},
JOURNAL = {Studia Logica. An International Journal for Symbolic Logic},
VOLUME = {59},
NUMBER = {1},
PAGES = {5-27},
NOTE = {but published later} }
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