Celebratio Mathematica

A. P. Calder­ón and R. Pe­p­in­sky: “On the phases of Four­i­er coef­fi­cients of pos­it­ive real peri­od­ic func­tions,” pp. 339–​349 in Com­put­ing meth­ods and the phase prob­lem in X-ray crys­tal ana­lys­is (State Col­lege, PA, 6–8 April 1950). Edi­ted by R. Pe­p­in­sky. Pennsylvania State Col­lege De­part­ment of Phys­ics, 1952. incollection