Hepola J. Desulphurization by limestone injection at high temperature / J. Hepola, 1990. - 41 p. - Текст : непосредственный.
Hepola J. Sulfur transformations in catalytic hot-gas cleaning of gasification gas : Diss. / J.Hepola, 2000. - Pag.var. с. - Текст : непосредственный.