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Hill, C. R. and El-Khayal, A. A. (1983): Late Permian plants including charophytes from the khuff formation of Saudi Arabia. Bull. Br. Mus. Nat. Hist. (Geol)., 37 (3): 105-112.
Okla, S. M. (1983): Microfacies of Hanifa formation (upper Jurassic) in central Tuwaiq Mountains. J. Coll. Sci. King Saud Univ., 14(1): 121-143.
Okla, S. M. (1984): Microfacies of the Jubaila limestone (upper Jurassic) in central Tuwaiq Mountains. J. Cool. Sci. K. S. Univ. , 15(2): 507-525.
Okla, S. M. (1984): Some Microfacies of Tuwaiq Mountain limestone (upper Jurassic) in central Tuwaiq Mountains.
Arab Gulf J. Scient. Res. 2(2): 483-494.
Hill, C. R., Wagner, R. H. and El-Khayal, A. A. (1985): Qasimia gen. nov., an early marattialike fern from the Permian of Saudi Arabia . Scripta Geol. , 79: 1-50.
Wagner, R. H., Hill, C. R. and El-Khayal, A. A. (1985): Gemellitheca gen. nov. , afertile pecopterid fern from the upper Permian of the Middle East . Scripta Geol., 79: 51-74.
El-Khayal, A. A. (1985): Occurrence of a characteristic Wealden fern (Weichselia reticulate) in the Wasia formation, central Saudi Arabia. Scripta Geol., 79: 75-88.
El- Asaad, G. M. A. (1989): Callovian colonial from the Towaiq mountain limestone of Saudi Arabia. Palaeontology, 32(3): 675-684.
Al-Bassam, A. A. (1999). Lattice parameters and optical absorption of Culn1-xGax Se2 thin films. Can. J. Phys. , 77(1999): 515-520.
Al-Bassam, A. A. (1999). Schottky barriers in Cd 1-x Znx Se mixed crystals with X=0.5 and X= 0.55. World Renewable Energy Congress VI 1-7-2000.
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