@article{10_1090_S0894_0347_1994_1224594_7,
     author = {Martin, D. A. and Steel, J. R.},
     title = {Iteration trees},
     journal = {Journal of the American Mathematical Society},
     pages = {1--73},
     publisher = {mathdoc},
     volume = {07},
     number = {1},
     year = {1994},
     doi = {10.1090/S0894-0347-1994-1224594-7},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1994-1224594-7/}
}