File contains some correspondence, handwritten notes and a collection of papers collated by W. Wallace in preparation of the study published together with HW in 1995 "Flying together in a larger and more diverse Union" focused on the terminology of 'differentiation' in the European integration process.

It includes among others:
Handwritten notes on conversations with academic personalities called on by W.W. in 1994 and 1995. Press cuttings from British newspapers (1994). A documentation collated by the German Institute for International and Security Affairs of the 'Stiftung Wissenschaft und Politik' (SWP) regarding theories and models of differentiated integration from 1974 to 1981, [s.d.].
- Documents created by the European Parliament: "Report of the Committee on Institutional Affairs on the Nature of Community Laws, rapporteur J.-L. Bourlanges [PE146.387/fin/B] (04/04/1991). "Verbatim report on proceedings 27-28/09/1994" and "Resolution on a multi-speed Europe" [PE182.022/9] (28/09/1994). "Note to all Socialist MEPs" by R. Corbett (29/06/1994).

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