@article{IM_1973__19_142191,
     author = {J.B. Walsh and R.T. Smythe},
     title = {The {Existence} of {Dual} {Processes.}},
     journal = {Inventiones mathematicae},
     pages = {113--148},
     publisher = {mathdoc},
     volume = {19},
     year = {1973},
     zbl = {0243.60008},
     url = {http://geodesic.mathdoc.fr/item/IM_1973__19_142191/}
}