@article{SF_1987__36_134889,
     author = {M.A. Freedman},
     title = {A random walk for the solution sought: {Remarks} on the difference scheme approach to nonlinear semigroups and evolution operators.},
     journal = {Semigroup forum},
     pages = {117--126},
     publisher = {mathdoc},
     volume = {36},
     year = {1987},
     zbl = {0644.47048},
     url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134889/}
}