48 It must be borne in mind in that regard that the concept of ‘objective grounds’ in clause 4(1) of the Framework Agreement must be understood as not permitting a difference in treatment between fixed-term workers and permanent workers to be justified on the basis that the difference is provided for by a general, abstract national norm, such as a law or collective agreement (judgments of 13 September 2007, Del Cerro Alonso, C‐307/05, EU:C:2007:509, paragraph 57; 22 December 2010, Gavieiro Gavieiro and Iglesias Torres, C‐444/09 and C‐456/09, EU:C:2010:819, paragraph 54; order of 18 March 2011, Montoya Medina, C‐273/10, not published, EU:C:2011:167, paragraph 40; judgment of 8 September 2011, Rosado Santana, C‐177/10, EU:C:2011:557, paragraph 72, and order of 9 February 2012, Lorenzo Martínez, C‐556/11, not published, EU:C:2012:67, paragraph 47).
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