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Purba, Lasman Parulian (2010) Suatu Tinjauan Prosedur Operasi Proses Produksi Produk Coran Besi Kelabu Case Study pada CV XYZ di Jawa Timur. In: Industrial Engineering Conference on Telecomunication Proceeding 2010. Membangun Kekuatan Industri di Indonesia Pada Era Pasar Bebas (ACFTA / WTO), Juni . Industrial Engineering Faculty Telkom Institute of Technology, Bandung, pp. 130-132. ISBN 2085-3955
Purba, Lasman Parulian and Dany, Dany (2010) A System Work Production Process Design An Improvement of the current molding sand unit in a foundry company located in East Java Indonesia. In: Proceeding National Conference on Green Technology for Better Future. Seminar Nasional Green Technology, Malang 20 November 2010 . Fakultas Sains dan Teknologi, UIN Maulana Malik Ibrahim Malang, Malang, F-30. ISBN 978-602-97320-1-6
Purba, Lasman Parulian and Sutanto, Andy C. (2011) A Design of Working System of Production Process using PROMODEL An Improvement of Work System of The Molding Sand Unit in a Foundry Company Located in East Java Indonesia. In: Proceedings Seminar Nasional Industrial Services 2011 "Strategi Daya Saing Industri Baja Hulu dan Hilir Melalui Reduksi Biaya, Peningkatan Kualitas, dan Fleksibilitas". Jurusan Teknik Industri Fakultas Teknik Universitas Sultan Ageng Tirtayasa, Cilegon-Banten, 11-12 Mei 2011, pp. 167-170. ISBN 978-602-97095-1-3
