Cherlin G.L. <br/><br/>
The Classification of Countable Homogeneous Directed Graphs and Countable Homogeneous n-tournaments. 
Cherlin G.L. 
 - Providence  Amer. Math. Soc.  1998 
 - 174 p. 
<br/><br/> Memoirs of the Amer. Math. Soc., Vol. 131, N 621 
<br/><br/><label>Dewey Class. No.: </label>MAMS