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The enumeration spectrum hierarchy of n-families., and . Math. Log. Q., 62 (4-5): 420-426 (2016)Elementary differences between the (2p)-c. e. and the (2p+1)-c. e. enumeration degrees.. J. Symb. Log., 72 (1): 277-284 (2007)Definability of the jump operator in the Enumeration Degrees.. J. Math. Log., (2003)Degree spectra and immunity properties., and . Math. Log. Q., 56 (1): 67-77 (2010)Total Degrees and Nonsplitting Properties of Enumeration Degrees., , , and . TAMC, volume 4978 of Lecture Notes in Computer Science, page 568-578. Springer, (2008)Density results in the Delta20 e-degrees., , and . Arch. Math. Log., 40 (8): 597-614 (2001)Jump inversions of algebraic structures and Σ-definability., , , , and . Math. Log. Q., 65 (1): 37-45 (2019)A Survey of Results on the d-c.e. and n-c.e. Degrees., and . Computability and Complexity, volume 10010 of Lecture Notes in Computer Science, page 469-478. Springer, (2017)Enumeration Degrees and Enumerability of Familes.. J. Log. Comput., 19 (1): 151-158 (2009)Foundations of Online Structure Theory., , , and . Bull. Symb. Log., 25 (2): 141-181 (2019)