Johnson, D. E. <br/><br/>
A handbook of active filters / 
D.E. Johnson, J.R. Johnson and H.P. Moore 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  1980 
 - 244 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliography ( p.235-237) and index. 
<br/><br/><label>ISBN: </label>0133724093 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric filters, Active