@inbook{Marsden1990,
author = {Marsden, P.V.},
title= {Network diversity, substructures, and opportunities for contact},
year = {1990},
editor = {Calhoun, C.},
editor = {Meyer, M.W.},
editor = {Scott, W.R.},
booktitle = {Structures of power and constraint: Papers in honor of Peter M. Blau},
publisher = {Cambridge University Press},
pages = {397--410},
}