au.\*:("SIEGBERG HW")
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COMPLEMENTARY PIVOTING AND THE HOPF DEGREE THEOREMPRUFER M; SIEGBERG HW.1981; J. MATH. ANAL. & APPL.; ISSN 0022-247X; USA; DA. 1981; VOL. 84; NO 1; PP. 133-149; BIBL. 26 REF.Article
ON COMPUTATIONAL ASPECTS OF TOPOLOGICAL DEGREE IN IR4PRUFER M; SIEGBERG HW.1979; LECTURE NOTES MATH.; DEU; DA. 1979; NO 730; PP. 410-433; BIBL. 17 REF.Conference Paper
