== Airy Function equal to J1(x)/x? == 

 Can you either provide a reference for this statement: 
 " In addition, a uniform function over a circular area (in one FT domain) corresponds to the Airy function, J1(x)/x in the other FT domain, where J1(x) is the first-order Bessel function of the first kind. "  
 or correct it? Airy function is not quite what you say it is...