| Authors | Year | Title | Publisher |
| Gay P | 1956 | The structure of the plagioclase feldspars: VI. Natural intermediate plagioclases | Mineralogical Magazine 31, p. 21-40 |
| Gay P & Bown MG | 1956 | The structure of the plagioclase feldspars: VII. The heat treatment of intermediate plagioclases | Mineralogical Magazine 31, p. 306-313 |
| Bown MG & Gay P | 1960 | An X-ray study of exsolution phenomena in the Skaergaard pyroxenes | Mineralogical Magazine 32, p. 379-388 |
| Gay P | 1961 | Some recent work on the plagioclase feldspars | Curs. Conf. Inst. Lucas Mallada, C.S.I.C. (España) 8, p. 159-164 |
| Gay P & Muir ID | 1962 | Investigation of the feldspars of the Skaergaard intrusion, eastern Greenland | Journal of Geology 70, p. 565-581 |