APA
(1992). Gas purification by use of hot metal getter beds. [s.l.]: [s.n.].
Chicago
1992. Gas purification by use of hot metal getter beds. [s.l.]: [s.n.].
Harvard
(1992). Gas purification by use of hot metal getter beds. [s.l.]: [s.n.].
MLA
Gas purification by use of hot metal getter beds. [s.l.]: [s.n.]. 1992.