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  DOI={10.1590/0103-9016-2014-0111},
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@phdthesis{
  asiamah2000,
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@book{
  blakemore1987,
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@book{
  blum2018,
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@book{
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@book{
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@book{
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@book{
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@article{
  juilleret2016,
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@article{
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@book{
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@book{
  köppen1936,
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@book{
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@book{
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@article{
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year={1996} }

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  url={https://www.rfbr.ru/rffi/ru/books/o_61096},
  note={Full text available at URL},
  publisher={Rossiĭskai︠a︡ akademii︠a︡ s.-kh. nauk, Pochvennyĭ in-t im. V.V. Dokuchaeva},
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year={1997} }

@article{
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@article{
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  url={https://doi.org/10.1080/00380768.2004.10408497},
  DOI={10.1080/00380768.2004.10408497},
  number={3},
  journal={Soil Science and Plant Nutrition},
  publisher={Taylor},
  author={Takahashi, Tadashi and Nanzyo, Masami and Shoji, Sadao},
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pages={431–437} }

@article{
  thien1979,
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  url={https://doi.org/10.2134/jae.1979.0054},
  DOI={10.2134/jae.1979.0054},
  number={1},
  journal={Journal of Agronomic Education},
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  author={Thien, Steve J.},
  year={1979},
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@book{
  un-fao2006,
  place={Rome, Italy},
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  title={Guidelines for soil description},
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year={2006} }

@article{
  uzarowicz2017,
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  ISSN={0341-8162},
  url={https://www.sciencedirect.com/science/article/pii/S0341816217301662},
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@book{
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  note={Citation Key: varghese1993laterite},
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  year={1993},
collection={Technical monograph} }

@book{
  worldre2006,
  place={Rome, Italy},
  edition={2},
  series={World soil resources reports},
  title={World reference base for soil resources 2006},
  ISBN={978-92-5-105511-3},
  publisher={Food and Agriculture Organization of the United Nations},
  editor={IUSS Working Group WRB,},
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collection={World soil resources reports} }

@article{
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@article{mehra1960,
	title = {Iron oxide removal from soils and clays by a dithionite-citrate system buffered with sodium bicarbonate},
	author = {Mehra, O P and Jackson, M L},
	year = {1960},
	date = {1960},
	journal = {Clays and Clay Minerals},
	pages = {317--327},
	volume = {7},
	note = {Place: Department of Soils, University of Wisconsin, Madison, WI}
}

@article{holmgren1967,
	title = {A Rapid Citrate-Dithionite Extractable Iron Procedure},
	author = {Holmgren, George G. S.},
	year = {1967},
	month = {03},
	date = {1967-03-01},
	journal = {Soil Science Society of America Journal},
	pages = {210--211},
	volume = {31},
	number = {2},
	doi = {10.2136/sssaj1967.03615995003100020020x},
	url = {https://doi.org/10.2136/sssaj1967.03615995003100020020x},
	note = {Publisher: John Wiley & Sons, Ltd},
	langid = {English}
}