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1Argitaratua 1976“...HV 482 .N532 c...”
Conference Proceeding Liburua -
2Argitaratua 1982“...HV 483 .N532 sj...”
Conference Proceeding Liburua -
3
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4Argitaratua 1996“...HV 40 .P273...”
Conference Proceeding Liburua