added SeisSol to the list of references
added SeisSol to the list of references

maxhutch/libxsmm,hfp/libxsmm,hfp/libxsmm,hfp/libxsmm,maxhutch/libxsmm,hfp/libxsmm,egeor/libxsmm,egeor/libxsmm,egeor/libxsmm,hfp/libxsmm,maxhutch/libxsmm,egeor/libxsmm,maxhutch/libxsmm,egeor/libxsmm,hfp/libxsmm,egeor/libxsmm