Lerman L M <br/><br/>
Four - dimensional intergrable hamiltonian systems with simple singular points    Topological aspects.      
Lerman L M; Umanskiy Ya L 
 -  1998 
<br/><br/><label>Standard No.: </label>14861 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B316, N8