KAJIAN TEORITIS SIFAT-SIFAT PERMUKAAN BAHAN ANTIFERROMAGNETIK BERLAPIS NiO DALAM MEDAN MAGNET LUAR (Theoretical Investigation on the Surface Properties of Layered Antiferromagnetic NiO in an External Magnetic Field - , Kamsul Abraha ([Yogyakarta] : Fakultas MIPA Universitas Gadjah Mada, 2004)