Kedudukan dan kekuatan mengikat nota kesepakatan (Memorandum of Understanding) ditinjau dari segi hukum perjanjian : analisis Putusan Mahkamah Agung No. 1681/K/PDT/2011 = Legal standing and binding of memorandum of understanding analyzed from contract law : analysis on Supreme Court Decision No. 1681/K/PDT/2011