@article {2007_Hendren_paper,
    AUTHOR = {Hendren, Stuart},
     TITLE = {Extra special defect groups of order $p^3$ and exponent $p$},
   JOURNAL = {J. Algebra},
  FJOURNAL = {Journal of Algebra},
    VOLUME = {297},
      YEAR = {2007},
     PAGES = {90--97},
      ISSN = {0021-8693},
     CODEN = {JALGA4},
}