The Hong Kong Basic Law Handbook is the leading authority on judicial consideration of the Hong Kong Basic Law.  Thoroughly revised for its second edition, the Handbook canvasses new developments in Hong Kong’s constitutional law including the addition of a fourth step in the proportionality test, the recognition of an overseas same-sex marriage for the purposes of a visa, a judicial review brought against the cessation of local jurisdiction over a portion of the Kowloon high speed rail terminal, and the issuance by the Standing Committee of an Interpretation of the Basic Law relating to the oath-taking requirements of legislative councillors.  

The book is available here.