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== Further reading ==
*{{Citation|last=Ritchey|first=Tom|title=Modelling Complex Policy Issues with Morphological Analysis|date=2011|url=http://dx.doi.org/10.1007/978-3-642-19653-9_4|work=Wicked Problems – Social Messes|pages=31–37|publisher=Springer Berlin Heidelberg|isbn=9783642196522|access-date=2019-05-05}}
*{{Cite journal |first1=Fritz |last1=Zwicky |
*{{Citation|last=Wilson|first=Albert|title=Epilogue|date=1967|url=http://dx.doi.org/10.1007/978-3-642-87617-2_17|work=New Methods of Thought and Procedure|pages=333–338|publisher=Springer Berlin Heidelberg|isbn=9783642876196|access-date=2019-05-05}}
*{{Cite journal|last=Jones|first=J. C.|date=July 1981|title=Design methods and theories|url=http://dx.doi.org/10.1016/0142-694x(81)90074-0|journal=Design Studies|volume=2|issue=3|pages=176|doi=10.1016/0142-694x(81)90074-0|issn=0142-694X|via=}}
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