“…Several authors followed up on relative Cohen-Macaulay modules; see e.g. [HSt,Sc2,R,JR,Ra2,RZ1,CH,Ra1,DGTZ1,Sc1,DGTZ2]. In particular, in [DGTZ2] the authors introduce the notion of arelative system of parameters which appears to be quite useful in studying relative Cohen-Macaulay modules.…”