Hebisch,U <br/><br/>
Semirings: algebraic theory and applications in computer science 
U.Hebisch and H.J.Weinert 
 - Singapore  World Scientific  1993 
 - Series in algebra v.5 .
<br/><br/><label>Subjects--Index Terms: </label>Semirings 
<br/><br/><label>Universal Decimal Class. No.: </label>512.53  / HEB