Measures to Prevent International Terrorism Which Endangers or Takes Innocent Human Lives or Jeopardizes Fundamental Freedoms and Study of the Underlying Causes of Those Forms of Terrorism and Acts of Violence Which Lie in Misery, Frustration, Grievance and Despair and Which Cause some People to Sacrifice Human Lives, Including Their Own, in an Attempt to Effect Radical Changes a, Report of the Secretary-General ; B, Convening, Under the Auspices of the United Nations, of an International Conference to Define Terrorism and to Differentiate It From the Struggle of Peoples for National Liberation