Hryniewicz, Umberto. <br/><br/>
Multiplicity results for periodic orbits of tight Reeb ows on the three-sphere. 

 - Rio de Janeiro:  IMPA,  2013. 
 - video online 
<br/><br/> Lecture. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Matematica.