Skjeltorp, A., & Helgesen, G. (1989). QUALITATIVE ASPECTS OF CONDENSATION, ORDERING AND AGGREGATION.
Lua i Stíl Chicago (17ú heag.)Skjeltorp, A., agus G. Helgesen. QUALITATIVE ASPECTS OF CONDENSATION, ORDERING AND AGGREGATION. 1989.
Lua MLA (9ú heag.)Skjeltorp, A., agus G. Helgesen. QUALITATIVE ASPECTS OF CONDENSATION, ORDERING AND AGGREGATION. 1989.
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