@article{10_37236_4568,
     author = {Neil Hindman and Imre Leader and Dona Strauss},
     title = {Extensions of infinite partition regular systems},
     journal = {The electronic journal of combinatorics},
     year = {2015},
     volume = {22},
     number = {2},
     doi = {10.37236/4568},
     zbl = {1325.05175},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/4568/}
}