Collect. Czech. Chem. Commun.
     1949, 14, 645-654
  https://doi.org/10.1135/cccc19490645
  
The gravimetric estimation of vanadates, chromates, molybdates and tungstates by means of acridine
J. Fidler
    
      Collect. Czech. Chem. Commun.
     1949, 14, 645-654
  https://doi.org/10.1135/cccc19490645