Althoughseveral articles need the authentication to access their PDF in a certain period 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. Guests except for members can purchase the PDF at Purchase Form (in Japanese). They can also purchase the PDF of the numbers former than Vol.36, No.2 at AI-shoko. The paper book or e-book of Kindle for each number can be purchased at Amazon.