Mr. Takashi Koyama authored an article concerning the investment treaty arbitration case of Achmea B.V. v. The Slovak Republic, UNCITRAL, Award on Jurisdiction, Arbitrability and Suspension, 26 October, 2010, that appeared in the 'JCA Journal'.

April 10, 2015 – Mr. Takashi Koyama authored an article in the 'JCA Journal' (Vol. 62, No. 4, April 2015) titled "The Existence of a “Dispute” and the Prima Facie Test for a Tribunal to Have Jurisdiction" (Achmea B.V. v. The Slovak Republic, UNCITRAL, PCA Case No. 2008-13 (formerly Eureko B.V. v. The Slovak Republic), Award on Jurisdiction, Arbitrability and Suspension, 26 October, 2010. (in 'JCA Journal', Vol. 62, No. 4, April 2015).