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Costello, Rory (2011) Does bicameralism promote stability? Inter-institutional relations and coalition formation in the European parliament. West European Politics, 34 (1). pp. 122-144. ISSN 0140-2382
Costello, Rory and Thomson, Robert (2011) The nexus of bicameralism: rapporteurs' influence on decision outcomes in the European Union. European Union Politics, 12 (3). pp. 337-357. ISSN 1465-1165
Costello, Rory and Thomson, Robert (2010) The policy impact of leadership in committees: rapporteurs' influence on the European Parliament's opinions. European Union Politics, 11 (2). pp. 219-240. ISSN 1465-1165
Wall, Matthew, Sudulich, Maria Laura , Costello, Rory and Leon, Enrique (2009) Picking your party online – an investigation of Ireland's first online voting advice application. Information Polity, 14 (3). pp. 203-218. ISSN 1570-1255
Costello, Rory and Thomson, Robert (2008) Election pledges and their enactment in coalition governments: a comparative analysis of Ireland. Journal of Elections, Public Opinion and Parties, 18 (3). pp. 239-256. ISSN 1745-7289
Costello, Rory and Thomson, Robert (2007) The fulfilment of election pledges. In: Gallagher, Michael and Marsh, Michael, (eds.) How Ireland Voted 2007: the Full Story of Ireland’s General Election. Palgrave Macmillan, Basingstoke, UK. ISBN 9780230500389
Costello, Rory (2014) A surge in support for independents and fringe parties is leading to an increasingly fragmented Irish party system. LSE European Politics and Policy (EUROPP) Blog (23 Oct 2014) Blog Entry.