Morris, D. E, A. G Markelz, J. YT Wei, C. T Huitgren, J. H Nickel, J. C Hamilton, and K. F McCarty. ?Site-Selective Oxygen-Isotope Substitution In Yba2Cu3O7???. Physical Review B 44 (1991). doi:10.1103/PhysRevB.44.9556.

Morris, D. E, J. H Nickel, A.G.  Markelz, R.  Gronksy, M.  Fendorf, and C. P Burmester. ?Conversion Of 124 And 123 + Cupric Oxide:  Microstructure And Phase Diagram?. Materials Research Society Symposium Proceedings, 1990.

Morris, D. E, A. G Markelz, B.  Fayn, and J. H Nickel. ?Conversion Of 124 Into 123+Cuo And 124, 123 And 247 Phase Regions In The Y-Ba-Cu-O System?. Physica C 168 (1990): 153-160. doi:10.1016/0921-4534(90)90118-X.

Morris, D. E, J. H Nickel, J. YT Wei, N. G Asmar, J. S Scott, U. M Scheven, C. T Hultgren, et al.. ?8 New High-Temperature Superconductors With The 1-2-4 Structure?. Physical Review B 39 (1989): 7347-7350. doi:10.1103/physrevb.39.7347 .

Morris, D. E, C. T Hultgren, A. M Markelz, J. YT Wei, N. G Asmar, and J. H Nickel. ?Oxygen Concentration Effect On Tc Of The Bi-Ca-Sr-Cu-O Superconductor?. Physical Review B 39 (1989): 6612-6614. doi:https://doi.org/10.1103/physrevb.39.6612 .

Morris, D. E, R. M Kuroda, A. G Markelz, J. H Nickel, and J. YT Wei. ?Small Oxygen Isotope Shift In Yba2Cu3O7?. Physical Review B 37 (1988): 5936-5939. doi:10.1103/physrevb.37.5936.

Fisher, R. A, S.  Kim, S. E Lacy, N. E Phillips, D. E Morris, A. G Markelz, J. YT Wei, and D. S Ginley. ?Specific-Heat Measurements On Superconducting Bi-Ca-Sr-Cu And Tl-Ca-Ba-Cu Oxides - Absence Of A Linear Term In The Specific-Heat Of Bi-Ca-Sr-Cu Oxides?. Physical Review B 38 (1988): 11942-11945. doi:10.1103/PhysRevB.38.11942.