"Method of Kjeldahl (digestion)" . . . "TotalN_kjeldahl"@en . "Kjeldahl, J. (1883)\u00A0\u2018Neue Methode zur Bestimmung des Stickstoffs in organischen K\u00F6rpern\u2019\u00A0(New method for the determination of nitrogen in organic substances),\u00A0Zeitschrift f\u00FCr analytische Chemie,\u00A022\u00A0(1)\u00A0: 366-383." . . . . "TotalN_kjeldahl" .