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1Argitaratua 1981“...QC 809 .M35 .P962 1981...”
Conference Proceeding Liburua -
2Argitaratua 1980“...QC 994.9 .V985 1980...”
Conference Proceeding Liburua -
3Argitaratua 1966“...QC 975 .V985 1966...”
Conference Proceeding Liburua