Analisis yuridis pemutusan hubungan kerja secara sepihak berdasarkan undang-undang nomor 13 tahun 2003 tentang ketenagakerjaan : studi kasus putusan Mahkamah Agung nomor 861 L/Pdt.Sus/2010 = Judicial analysis of the unilateral termination of employment by law act no. 13 of 2003 about employment : case study Supreme Courts decision no. 861 K/Pdt.Sus/2010