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Developments in Biological Standardization|January 1, 1986
Effect of oxidation on the stability of tuberculin purified protein derivative (PPD)S Landi, H R HeldDevelopments in Biological Standardization|January 1, 1986
The need to redefine the unit of the international standard for tuberculin purified protein derivative (PPD-S)S Landi, H R HeldJournal of Biological Standardization|January 1, 1977
Water permeability of elastomersH R Held, S LandiJournal of Pharmaceutical Sciences|November 1, 1980
Binding of toxic metabolites of isoniazid by aconiazideH R Held, S LandiThe American Review of Respiratory Disease|January 1, 1975
Effect of light on tuberculin purified protein derivative solutionsS Landi, H R HeldJournal of Biological Standardization|July 1, 1985
Loss of preservative from a tuberculin solution in rubber stoppered vials fastened with different sealsH R Held, S LandiApplied Microbiology|November 1, 1970
Comparative study of 14C-labeled purified protein derivative from various mycobacteria. II. Skin cross-reactivity in sensitized guinea pigsS Landi, H R HeldTubercle|June 1, 1978
Stability of dilute solutions of tuberculin purified protein derivativeS Landi, H R HeldDevelopments in Biological Standardization|January 1, 1975
The multi-facets of tuberculin standardizationS Landi, H R Held, K C GuptaBulletin of the World Health Organization|January 1, 1970
Evaluation of various substances to prevent adsorption of tuberculin purified protein derivative (PPD) to glass surfacesS Landi, H R Held, M C TsengPageof 11