Althoughseveral articles need the authentication to access their PDF in two years after the day of issue, JSAI individual members could download it for free. If you are the member, please log on JSAI membership information management system to know your ID and password for the authentication. Note that passwords of the two systems are different. Those who are not JSAI member can purchase PDFs at Purchase Form (in Japanese). The paper book or e-book of Kindle for each number are available at Amazon.