Some  (most) Collaborators  
<br>
<br>

<A HREF='http://www.math.umn.edu/~rmoeckel/'>
Rick Moeckel </A> U. of Minn.  
<br>



<A HREF='http://www.imcce.fr/Equipes/ASD/person/chenciner/'>
Alain Chenciner </A> Bureau des Longitudes et Paris 7 
<br>

<br>
<A HREF='http://wagner.ucsc.edu/'> Onuttom Narayan </A> Physics, UCSC.

<br>
<A HREF='
http://www.cimat.mx/~gil/'>
Gil Bor </A>
CIMAT, Guanajuato, Mexico
<br>

<A HREF='http://www-stat.stanford.edu/~susan/'>

Susan Holmes </A>
Stanford,  Statistics Dept.
<br>

<A HREF='http://www-stat.stanford.edu/~cgates/PERSI/'>
Persi Diaconis </A>
Stanford, Math Dept and Statistics Dept.

<br>

<A HREF='http://www.maths.usyd.edu.au/u/dullin/'> Holger Dullin </A>



<br>
<A HREF='http://faculty.tmcc.edu/kehlers/'>Kurt Ehlers</A>  Truckee Meadow's Community College
<br>

<A HREF="https://www.ceremade.dauphine.fr/~fejoz"> Jacques Fejoz </A>
<br>
<A HREF='http://www.clas.kitasato-u.ac.jp/~fujiwara'>Toshiaki  Fujiwara </A> Kitasato University

<br>


<A HREF='http://www.unca.edu/faces/faculty/sam-kaplan'> Sam Kaplan </A>
<br>
 
<br>


Andreas Knauf
<br>

<A HREF='http://epge.fgv.br/en/faculty/jair-koiller'> Jair Koiller </A> Getulio Vargas Foundation, Graduate School of Economics
<br>



<A HREF='http://www.math.psu.edu/levi/Welcome.html'> Mark Levi </A>
<br>

Hector Sanchez Morgada
<br>

Enrico LeDonne
<br>


<br>
Carles Simo
  see: 
<A HREF='http://www.maia.ub.es/dsg/nbody.html'>
Simo's choreography movies </A>


<br>
<A HREF='http://staff.math.su.se/shapiro/'>

Boris Shapiro </A>

<br>
<br>

Andrea Venturelli 

<br>
<A HREF='http://www.math.technion.ac.il/~mzhi/main.html'>
Michail Zhitomirskii </A>
Technion, Haifa.