Van Stewart, E. & Longwell, Bernard B. Ultramicro Methods in Biochemistry: [Part] 5. A Comparison of the Ultramicro Determination of Phosphorus Using N-Phenyl-p-Phenylenediamine or 1-Amino-2-Naphthol-4-Sulfonic Acid, [Part] 6. The Determination of Serum Alkaline Phosphatase, report, December 1964; (https://digital.library.unt.edu/ark:/67531/metadc13137/m1/1/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .