TY  - SER
AU  - Angel, T. Zvezdov
AU  - Diliana, T. Zvezdova
AU  - Krasimir, T. Petkov
TI  - Deionization of Water  for  Small Factories Or Laboratories By A Four-Stage Ion-Exchange Device
KW  - Deionization
KW  - Multistage
KW  - Filtration
ER  -