1. Barker-Read, G.R., 1980. The geology and related aspects of coal and gas outbursts in the Gwendraeth valley. MSc Thesis. Univ. Wales, Cardiff.
2. The effect of shearing on quality of some coals in the southeastern Canadian Cordillera;Bustin;Can. Inst. Min. Met. Bull.,1982
3. Striated conical structures and related fractures in bituminous coal of the southern Canadian Rocky Mountains;Bustin;Int. J. Coal Geol.,1982
4. Bustin, R.M., 1986. Characteristics and mechanisms for the formation of structurally thickened coal deposits in the Southwestern Canadian Cordillera. Compte Rendu, 9th. Int. Congr. Carbonifereous Stratigraphy and Geology, 4: pp. 709–721.
5. Variscan structures in the opencast coal sites of the South Wales coalfield;Cole;Proc. Ussher Soc.,1991