Pornthep Chao-opas. 2002. Yield improvement of the hot rolled steel coil industry. Field of Study Engineering Management, Chulalongkorn University;
Pornthep Chao-opas. (2002) Yield improvement of the hot rolled steel coil industry . Chulalongkorn University/Bangkok.
Pornthep Chao-opas. Yield improvement of the hot rolled steel coil industry. . Bangkok:Chulalongkorn University, 2002.
Pornthep Chao-opas. (2002) Yield improvement of the hot rolled steel coil industry . Chulalongkorn University/Bangkok.