Conrad, H.; Gerhard Ertl; Latta, E.E. (February 1974). "Adsorption of hydrogen on palladium single crystal surfaces". Surface Science41 (2): 435–446. doi:10.1016/0039-6028(74)90060-0. Bibcode: 1974SurSc..41..435C.
Christmann, K.; Gerhard Ertl; Pignet, T. (February 1976). "Adsorption of hydrogen on a Pt(111) surface". Surface Science54 (2): 365–392. doi:10.1016/0039-6028(76)90232-6. Bibcode: 1976SurSc..54..365C.
Imbihl, R.; Behm, R. J.; Christmann, K.; Gerhard Ertl; Matsushima, T. (May 2, 1982). "Phase transitions of a two-dimensional chemisorbed system: H on Fe(110)". Surface Science117 (1): 257–266. doi:10.1016/0039-6028(82)90506-4. Bibcode: 1982SurSc.117..257I.
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Conrad, H.; Gerhard Ertl; Latta, E.E. (February 1974). "Adsorption of hydrogen on palladium single crystal surfaces". Surface Science41 (2): 435–446. doi:10.1016/0039-6028(74)90060-0. Bibcode: 1974SurSc..41..435C.
Christmann, K.; Gerhard Ertl; Pignet, T. (February 1976). "Adsorption of hydrogen on a Pt(111) surface". Surface Science54 (2): 365–392. doi:10.1016/0039-6028(76)90232-6. Bibcode: 1976SurSc..54..365C.
Imbihl, R.; Behm, R. J.; Christmann, K.; Gerhard Ertl; Matsushima, T. (May 2, 1982). "Phase transitions of a two-dimensional chemisorbed system: H on Fe(110)". Surface Science117 (1): 257–266. doi:10.1016/0039-6028(82)90506-4. Bibcode: 1982SurSc.117..257I.