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194
204. Tzvetkova P-G., Nickolov R-N., Tzvetkova C-T. (2016) Diatomite/Carbon
adsorbent for phenol removal. Journal of Chemical Technology and Metallurgy. Vol.
51, 2, no. 8 202-209p.
205. U.S. Geological Survey (2011) Mineral commodity summaries 2011. U.S.
Geological Survey, 198 p.
206. U.S. Geological Survey (2020) Mineral commodity summaries 2020: U.S.
Geological Survey, 200 p., https://doi.org/10.3133/ mcs2020. ISBN 978-1-41134362-7.
207. Vargas A-A. (2007) La tierra moler o “diatomita” como sistema de remoción de
sustancias químicas en el laboratorio. Ciencia y Tecnología. Vol. 25(1-2), 83-96p.
208. Vassileva P., Gentscheva G., Ivanova E., Tzvetkova P., Voykova D., Apostolova
M. (2011) Characterization of natural diatomites from Bulgaria. Comptes rendus de
l’Acad´emie
bulgare
des
Sciences.
Tome
64-N06-2011.
https://www.researchgate.net/publication/280577650.
209. Vatan A. (1967) manuel de sédimentologie. Paris : Technip, 397p.
210. Verdeja G-L-F., Garcia M-P, Vasquez E-R., Barranzuela J-L., Pastor R. (1992)
Contribución al estudio de las diatomitas del Perú. BOL. Sociedad Española De
Cerámica Y Vidrio. Vol. 3(5), 427-33p.
211. Weiland E. (2015) Caractérisation des propriétés texturales et de transport de
supports de catalyseurs : apport de la RMN du 129Xe. Thèse de doctorat : ChimiePhysique. Paris : Université Pierre et Marie Curie. 176p.
212. Whiting M.C. et Schrader H. (1985) late Miocene to early Pliocene marine diatom
and silicoflagelate floras from the Oregon coast and continental shelf.
Micropaleontology. Vol.31, no.3.
213. William H-A. et Andrews G-W. (1979) Middle Miocene marine diatoms from the
Rideland Trough, south Carolina and Georgia. Micropaleontology. Vol. 25, no. 3,
255-271p. Pls. 1-8.
214. Williams D-M. et Kociolek J-P. (2007) Pursuit of a natural classification of
diatoms: History, monophyly and the rejection of paraphyletic taxa. European
Journal of Phycology. Vol. 42, no. 3, 313-319p. DOI: 10.1080/09670260701419921.
215. Wilson T-M. (1907) The chemistry and staining properties of certains derivatives of
the methylene blue. American Journal of Physiology. Vol.19, 647-670p.