The Law Library currently has a trial to Kluwer International Tax Law (KITL). You have access to Kluwer International Tax Law until the end of October 2020.
KITL is a research platform for tax professionals leveraging international content and practical tools providing answers. The platform consists of several modules, providing knowledge on cross-border Tax topics: Expert Tax Treaty Analysis, Permanent Establishments, Base Erosion and Profit Shifting (BEPS) & Transfer Pricing, Intertax/EC Tax, VAT, Tax Planning and Trusts, Real Estate Investment Trusts, Expatriation, Tax and Financial Accounting.
When you are logged on to the UvA-network KITL is accessible to you via the link below.