Bellman, Richard Ernest,  1920-1984, <br/><br/>
Perturbation techniques in mathematics, physics, and engineering. 

 - viii, 118 páginas 
 - Athena series, selected topics in mathematics .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Perturbación (Matemáticas)
<br/><br/><label>LC Class. No.: </label>QA871  / B4