Prosiding Seminar Nasional Rekayasa Perencanaan V : The role of civil engineering sciences in the usefulness of natural resources supporting the enchement of national economy , Surabaya 26 Juli 2005 - Indrasurya B. Mochtar (Jurusan Teknik Sipil Fakultas Teknik Sipil dan Perencanaan Universitas Pembangunan Nasional "Veteran", 2005)