Rymer, H.; Brown, G. C (1986). "Gravity fields and the interpretation of volcanic structures: Geological discrimination and temporal evolution". Journal of Volcanology and Geothermal Research. 27 (3): 229–254. Bibcode:1986JVGR...27..229R. doi:10.1016/0377-0273(86)90015-6. ISSN0377-0273.
Rymer, Hazel; van Wyk de Vries, Benjamin; Stix, John; Williams-Jones, Glyn (1998). "Pit crater structure and processes governing persistent activity at Masaya Volcano, Nicaragua". Bulletin of Volcanology. 59 (5): 345–355. Bibcode:1998BVol...59..345R. doi:10.1007/s004450050196. ISSN1432-0819. S2CID53990763.
Rymer, H.; Brown, G. C (1986). "Gravity fields and the interpretation of volcanic structures: Geological discrimination and temporal evolution". Journal of Volcanology and Geothermal Research. 27 (3): 229–254. Bibcode:1986JVGR...27..229R. doi:10.1016/0377-0273(86)90015-6. ISSN0377-0273.
Rymer, Hazel; van Wyk de Vries, Benjamin; Stix, John; Williams-Jones, Glyn (1998). "Pit crater structure and processes governing persistent activity at Masaya Volcano, Nicaragua". Bulletin of Volcanology. 59 (5): 345–355. Bibcode:1998BVol...59..345R. doi:10.1007/s004450050196. ISSN1432-0819. S2CID53990763.
Rymer, H.; Brown, G. C (1986). "Gravity fields and the interpretation of volcanic structures: Geological discrimination and temporal evolution". Journal of Volcanology and Geothermal Research. 27 (3): 229–254. Bibcode:1986JVGR...27..229R. doi:10.1016/0377-0273(86)90015-6. ISSN0377-0273.