An abstract setting for homotopy pushouts and pullbacks

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1. Y. L. Wong, Chain homotopy pullbacks and pushouts
2. Ronald Brown, Philip J. Higgins, The equivalence of $\infty$-groupoids and crossed complexes
3. Timothy Porter, Crossed modules in $Cat$ and a Brown-Spencer theorem for $2$-categories
4. Andrée Ehresmann, Charles Ehresmann, Multiple functors. II. The monoidal closed category of multiple categories
5. C. B. Spencer, Y. L. Wong, Pullback and pushout squares in a special double category with connection
6. Andrée Ehresmann, Charles Ehresmann, Multiple functors. IV. Monoidal closed structures on $Ca{t}_n$
7. Robert Dawson, Robert Pare, General associativity and general composition for double categories
8. Ronald Brown, Marek Golasinski, A model structure for the homotopy theory of crossed complexes
9. R. J. M. Dawson, R. Pare, D. A. Pronk, Free extensions of double categories