New papers were added to the CvGmt Preprint Server - http://cvgmt.sns.it/ Title: Elements of Geometric Measure Theory on Sub-Riemannian groups Author: Magnani, Valentino http://cvgmt.sns.it/papers/mag02a/ Title: Unrectifiability and rigidity in stratified groups Author: Magnani, Valentino http://cvgmt.sns.it/papers/mag04/