(en-US) Jeremy Pearce, « Keiiti Aki, 75, Is Dead; Developed a Way to Measure the Strength of an Earthquake », The New York Times, (ISSN0362-4331, lire en ligne, consulté le )
(en-US) Jeremy Pearce, « Keiiti Aki, 75, Is Dead; Developed a Way to Measure the Strength of an Earthquake », The New York Times, (ISSN0362-4331, lire en ligne, consulté le )