Capogna, Luca. <br/><br/>
Introduction to the Heisenberg Group and the Sub-Riema ian Isoperimetric Problem [electronic resource]   
by Luca Capogna. et al 
 - Basel  Birkh user Verlag AG  2007 
<br/><br/> http://dx.doi.org/10.1007/978-3-7643-8133-2 
<br/><br/><label>ISBN: </label>9783764381332 
<br/><br/><label>Dewey Class. No.: </label>516.35  / (e-book)