1. A visible method for titration and neutralization of viruses on the basis of pH changes in tissue cultures;Huang,1943
2. A simplified colorimetric test for poliomyelitis virus and antibody;Lipton,1955
3. Propagation in vitro of poliomyelitis viruses VII. pH Change of HeLa cell cultures for assay;Robertson,1955
4. Use of color change of phenol red as the indicator in titrating poliomyelitis virus or its antibody in a tissue-culture system;Salk;Am. J. Hyg.,1954
5. Cell and Tissue Culture;Paul,1975