Klausula Unforeseeable Difficulties dalam Penerapan Kontrak Engineering, Procurement and Construction dengan Standar Kontrak FIDIC Conditions of Contract for EPC/Turnkey Projects First Edition 1999 (Studi Pada Proyek Kereta Cepat Jakarta - Bandung) = Unforeseeable Difficulties in the Implementation of Engineering, Procurement and Construction Contracts with Contract Standards FIDIC Conditions of Contract for EPC/Turnkey Projects First Edition 1999 (Study on the Jakarta - Bandung High Speed Rail Projec