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| title = Theorem Proving in Higher Order Logics, 9th International Conference, TPHOLs'96, Turku, Finland, August 26-30, 1996, Proceedings
| volume = 1125
| year = 1996| isbn = 978-3-540-61587-3
| year = 1996}}</ref> Another use for fresh variables involves the development of [[loop invariant]]s in [[formal verification|formal program verification]], where it is sometimes useful to replace constants by newly introduced fresh variables.<ref>{{cite book
| last = Cohen | first = Edward
| contribution = Loops B — On replacing constants by fresh variables