Monolingual examples (not verified by PONS Editors)

English
It is grammar and rhetoric, semiotics and systems theory, the history and the philosophy of technology.
en.wikipedia.org
He applied the field-of-systems theory to global problems, helped inspire the group of planners, diplomats, scientists and academics who came together as the Club of Rome.
en.wikipedia.org
Systems theory has been formalized since the 1950s, and a long set of specialized systems theories and cybernetics exist.
en.wikipedia.org

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