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1Argitaratua 1989“...QC 869.4 .A6 .I88 1st...”
Liburua -
2Argitaratua 1992“...QC 869.4 .A6 .I88 3rd...”
Conference Proceeding Liburua -
3Argitaratua 1957“...QC 851 .P762...”
Conference Proceeding Liburua