Sophus Lie's 1884 differential invariant paper. Math Sci Press, Brookline, Mass., 1976. In part a translation of ``On differential invariants'' [Über Differentialinvarianten] by S. Lie [Math. Ann. \bf24 (1884), 537–578], Translated from the German by M. Ackerman, Comments and additional material by Robert Hermann, Lie Groups: History, Frontiers and Applications, Vol. III
bibtex   
@book {MR0490975,
     TITLE = {Sophus {L}ie's 1884 differential invariant paper},
      NOTE = {In part a translation of ``On differential invariants''
              [{\"U}ber Differentialinvarianten] by S. Lie [Math. Ann.
              {{\bf{2}}4} (1884), 537--578],
              Translated from the German by M. Ackerman,
              Comments and additional material by Robert Hermann,
              Lie Groups: History, Frontiers and Applications, Vol. III},
 PUBLISHER = {Math Sci Press},
   ADDRESS = {Brookline, Mass.},
      YEAR = {1976},
     PAGES = {viii+273},
   MRCLASS = {01A75 (01A55 22E05 35A30 58H05)},
  MRNUMBER = {0490975 (58 \#10262)},
MRREVIEWER = {Thomas Hawkins},
  BOEKCODE = {53A55},
}

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