00310nam a2200109Ia 4500008004100000082001800041100001900059245007500078250001200153260002700165300000800192240913s9999||||xx |||||||||||||| ||und||  a515.75  GIL/A  aAttila Gilanyi 3aAn Introduction to the theory of functional equations and inequalities  a2nd Ed.  bBirkhauseraNULLc2009  a595