Tipawan Ningnoi. 1992. Determination of some natural radionuclides in lignite and lignite ash. Graduate School, Chulalongkorn University;
Tipawan Ningnoi. (1992) Determination of some natural radionuclides in lignite and lignite ash . Chulalongkorn University/Bangkok.
Tipawan Ningnoi. Determination of some natural radionuclides in lignite and lignite ash. . Bangkok:Chulalongkorn University, 1992.
Tipawan Ningnoi. (1992) Determination of some natural radionuclides in lignite and lignite ash . Chulalongkorn University/Bangkok.