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Rational curves of higher degree on a complete intersection Calabi-Yau threefold in P³xP³ projective line
by Dag Einar Sommervoll
Bok Engelsk 1994
Nonresponse models for panel surveys
by Jan F. Bjørnstad and Dag Einar Sommerv...
Bok Engelsk 1993
Rational curves of low degree on a complete intersection Calabi-Yau threefold in P³ X P³
by Dag Einar Sommervoll
Bok Engelsk 1993