HEGAZY, W. H.2019-04-222019-04-221303-6017http://hdl.handle.net/20.500.12575/61947https://doi.org/10.1501/Commub_0000000391Spectrophotometric microdetermination of trivalent Sc, Y and La ions with 4-phenylazo-7- (2-arsonophenylazo)-chromotropic acid001010