Markov chains. by David Freedman. springer‐verlag, new york, heidelberg, approximating countable markov chains. by David Freedman. Springer‐Verlag, Brownian Motion and Diffusion. By David Freedman. Springer‐Verlag, New York, Berlin, 1983. xiv + 382 pp. ISBN 0‐387‐90308‐0. New York, Heidelberg, Berlin, 1983. x + 140 pp. ISBN 0‐387‐90804‐8. Heidelberg, Berlin, 1983. xii + 231 pp. ISBN 0‐387‐90805‐6