Combinatorica
http://www.springerlink.com/content/0209-9683

Combinatorica is an international journal of the János Bolyai Mathematical Society. It publishes research papers on a variety of areas of combinatorics and the theory of computing, with particular emphasis on general techniques and unifying principles.
Coverage in Combinatorica includes:

* combinatorial structures (graphs, hypergraphs, matroids, designs, permutation groups)

* combinatorial optimization

* combinatorial aspects of geometry and number theory

* algorithms in combinatorics and related fields

* computational complexity theory

* randomization and explicit construction in combinatorics and algorithms.