00717naa a2200241 a 450000100080000000500110000800800410001902400390006010000160009924501110011526000090022665000210023565000170025665000170027365000210029065000230031165000190033465000220035370000210037570000240039670000220042077300330044221296452021-01-28       2020    bl uuuu     u00u1 u    #d7 a10.1016/j.heliyon.2020.e040782DOI1 aMACHADO, W.  aSpectroscopic characterization of humic and fulvic acids in soil aggregates, Brazilh[electronic resource]  c2020  aHumic substances  aSoil science  aSpectroscopy  aAnálise do Solo  aComposto Orgânico  aEspectrometria  aEstrutura do Solo1 aFRANCHINI, J. C.1 aGUIMARAES, M. de F.1 aTAVARES FILHO, J.  tHeliyongv. 6, e04078, 2020.