RILEM, TC 107, “Guidelines for characterizing concrete creep and shrinkage in structural design codes or recommendations", Materials and structures 28 (1995), 52-55. See also RILEM TC69, “Conclusions for structural analysis and for formulation of standard design recommendations," Chapter 6 in Mathematical Modeling of Creep and Shrinkage of Concrete, ed. by Z.P. Bazant, John Wiley and Sons, Chichester and New York, y1988; reprinted in Materials and Structures (RILEM, Paris) 20 (y1987), 395-398, and in ACI Materials Journal 84 (y1987), 578-581.