@book{Abraham2009:RSTbook,
 author = {Ajith Abraham and Rafael Falcon and Rafael Bello},
 title = {{Rough Set Theory: a True Landmark in Data Analysis}},
 year = {2009},
 isbn = {978-3-540-89920-4},
 publisher = {Springer Verlag},
 address = {Berlin-Heidelberg, Germany},
}