Doran R.S. <br/><br/>
Approximate identities and factorization in Banach modulus. 
Doran R.S., Wichmann J. 
 - Berlin  Springer-Verlag  1979 
 - 305 p. 
<br/><br/> Lecture Notes in Mathematics, Vol. 768 
<br/><br/><label>Dewey Class. No.: </label>517.986