TY - BOOK AU - Capogna,L.,et al ED - Danielli, D ED - Pauls, S.D ED - Tyson, J.T TI - Introduction to the Heisenberg group & the sub-riemannian isoperimetric problem T2 - Progress in mathematics 259 SN - 9783764381325 U1 - 8.04+8.05 PY - 2007/// CY - Basel PB - Birkhauser-Verlag ER -