- Halkoaho, T.A.A., Alapaieti, T.T., and Lahtinen, J.J. (1989a) The Sompujärvi PGE mineralization in the Penikat layered intrusion, N Finland. In Early Proterozoic layered intrusions in the northeastern part of the Fennoscandian Shield (T. Alapieti, Editor). 5. Intern. Platinum Symposium, Guide to the Post-Symposium Field Trip, Geol. Survey of Finland, Guide 29: 71-92.
- Halkoaho, T.A.A., Alapaieti, T.T., and Lahtinen, J.J. (1989b) The Sompujärvi PGE mineralization in the Kirakkajuppura area. Descriptions of Post-Symposium Field Excursion Sites. Site 6. In Early Proterozoic Layered Intrusions in the Northeastern Part of the Fennoscandian Shield (T Alapieti, Editor). 5. Intern. Platinum Symposium, Guide to the Post-Symposium Field Trip, Geol. Survey of Finland, Guide 29: 212-216.
- Halkoaho, T.A.A., Alapaieti, T.T., and Lahtinen, J.J. (1990) The Sompujärvi PGE Reef in the Penikat layered intrusion, N Finland. Miner. Petrol.: 42: 39-55.
- Halkoaho, T.A.A. (1993) The Sompujärvi and Ala-Penikka PGE reefs in the Penikat layered intrusion, N Finland: implications for PGE reef-forming processes. Acta Univ. Oul. A249, Univ. Oulu, Oulu, Finland.
- Doc Diether
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