@article {2005_Hendren_paper,
    AUTHOR = {Hendren, Stuart},
     TITLE = {Extra special defect groups of order $p^3$ and exponent $p^2$},
   JOURNAL = {J. Algebra},
  FJOURNAL = {Journal of Algebra},
    VOLUME = {291},
      YEAR = {2005},
     PAGES = {457--491},
      ISSN = {0021-8693},
     CODEN = {JALGA4},
}