- Degrees of rigidity for Souslin trees
- G. Fuchs and J. D. Hamkins, “Degrees of rigidity for Souslin trees,” Journal of Symbolic Logic, vol. 74, iss. 2, p. 423–454, 2009.

[Bibtex]`@ARTICLE{FuchsHamkins2009:DegreesOfRigidity, AUTHOR = {Fuchs, Gunter and Hamkins, Joel David}, TITLE = {Degrees of rigidity for {S}ouslin trees}, JOURNAL = {Journal of Symbolic Logic}, FJOURNAL = {Journal of Symbolic Logic}, VOLUME = {74}, YEAR = {2009}, NUMBER = {2}, PAGES = {423--454}, ISSN = {0022-4812}, CODEN = {JSYLA6}, MRCLASS = {03E05}, MRNUMBER = {2518565 (2010i:03049)}, MRREVIEWER = {Stefan Geschke}, URL = {http://wp.me/p5M0LV-3A}, doi = {10.2178/jsl/1243948321}, eprint = {math/0602482}, archivePrefix = {arXiv}, primaryClass = {math.LO}, file = F, }`

- G. Fuchs and J. D. Hamkins, “Degrees of rigidity for Souslin trees,” Journal of Symbolic Logic, vol. 74, iss. 2, p. 423–454, 2009.
- Changing the heights of automorphism towers by forcing with Souslin trees over $L$
- G. Fuchs and J. D. Hamkins, “Changing the heights of automorphism towers by forcing with Souslin trees over $L$,” Journal of Symbolic Logic, vol. 73, iss. 2, p. 614–633, 2008.

[Bibtex]`@ARTICLE{FuchsHamkins2008:ChangingHeightsOverL, AUTHOR = {Fuchs, Gunter and Hamkins, Joel David}, TITLE = {Changing the heights of automorphism towers by forcing with {S}ouslin trees over {$L$}}, JOURNAL = {Journal of Symbolic Logic}, VOLUME = {73}, YEAR = {2008}, NUMBER = {2}, PAGES = {614--633}, ISSN = {0022-4812}, CODEN = {JSYLA6}, MRCLASS = {03E35}, MRNUMBER = {2414468 (2009e:03094)}, MRREVIEWER = {Lutz Struengmann}, URL = {http://wp.me/p5M0LV-3l}, doi = {10.2178/jsl/1208359063}, eprint = {math/0702768}, archivePrefix = {arXiv}, primaryClass = {math.LO}, file = F, }`

- G. Fuchs and J. D. Hamkins, “Changing the heights of automorphism towers by forcing with Souslin trees over $L$,” Journal of Symbolic Logic, vol. 73, iss. 2, p. 614–633, 2008.
- How tall is the automorphism tower of a group?
- J. D. Hamkins, “How tall is the automorphism tower of a group?,” in Logic and Algebra, Y. Zhang, Ed., Providence, RI: AMS, 2002, vol. 302, p. 49–57.

[Bibtex]`@INCOLLECTION{Hamkins2001:HowTall?, AUTHOR = {Hamkins, Joel David}, TITLE = {How tall is the automorphism tower of a group?}, BOOKTITLE = {{Logic and Algebra}}, SERIES = {Contemporary Math.}, VOLUME = {302}, PAGES = {49--57}, PUBLISHER = {AMS}, ADDRESS = {Providence, RI}, YEAR = {2002}, MRCLASS = {20E36 (03E35 20A15 20F28)}, MRNUMBER = {1928383 (2003g:20048)}, MRREVIEWER = {Martyn R.~Dixon}, editor = {Yi Zhang}, doi = {10.1090/conm/302}, url = {http://wp.me/s5M0LV-howtall}, }`

- J. D. Hamkins, “How tall is the automorphism tower of a group?,” in Logic and Algebra, Y. Zhang, Ed., Providence, RI: AMS, 2002, vol. 302, p. 49–57.
- Changing the heights of automorphism towers
- J. D. Hamkins and S. Thomas, “Changing the heights of automorphism towers,” Ann.~Pure Appl.~Logic, vol. 102, iss. 1-2, p. 139–157, 2000.

[Bibtex]`@article {HamkinsThomas2000:ChangingHeights, AUTHOR = {Hamkins, Joel David and Thomas, Simon}, TITLE = {Changing the heights of automorphism towers}, JOURNAL = {Ann.~Pure Appl.~Logic}, FJOURNAL = {Annals of Pure and Applied Logic}, VOLUME = {102}, YEAR = {2000}, NUMBER = {1-2}, PAGES = {139--157}, ISSN = {0168-0072}, CODEN = {APALD7}, MRCLASS = {20F28 (03E35 20A15)}, MRNUMBER = {1732058 (2000m:20057)}, MRREVIEWER = {Markus Junker}, DOI = {10.1016/S0168-0072(99)00039-1}, URL = {http://jdh.hamkins.org/changingheightsoverl/}, eprint = {math/9703204}, archivePrefix = {arXiv}, primaryClass = {math.LO}, }`

- J. D. Hamkins and S. Thomas, “Changing the heights of automorphism towers,” Ann.~Pure Appl.~Logic, vol. 102, iss. 1-2, p. 139–157, 2000.
- Every group has a terminating transfinite automorphism tower
- J. D. Hamkins, “Every group has a terminating transfinite automorphism tower,” Proc.~Amer.~Math.~Soc., vol. 126, iss. 11, p. 3223–3226, 1998.

[Bibtex]`@article {Hamkins98:EveryGroup, AUTHOR = {Hamkins, Joel David}, TITLE = {Every group has a terminating transfinite automorphism tower}, JOURNAL = {Proc.~Amer.~Math.~Soc.}, FJOURNAL = {Proceedings of the American Mathematical Society}, VOLUME = {126}, YEAR = {1998}, NUMBER = {11}, PAGES = {3223--3226}, ISSN = {0002-9939}, CODEN = {PAMYAR}, MRCLASS = {20E36 (20F28)}, MRNUMBER = {1487370 (2000e:20057)}, DOI = {10.1090/S0002-9939-98-04797-2}, URL = {http://jdh.hamkins.org/everygroup/}, eprint = {math/9808014}, archivePrefix = {arXiv}, primaryClass = {math.LO}, }`

- J. D. Hamkins, “Every group has a terminating transfinite automorphism tower,” Proc.~Amer.~Math.~Soc., vol. 126, iss. 11, p. 3223–3226, 1998.

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