PubMed=
4472134; DOI=
10.1093/jnci/53.3.751
Nelson-Rees W.A., Zhdanov V.M., Hawthorne P.K., Flandermeyer R.R.
HeLa-like marker chromosomes and type-A variant glucose-6-phosphate dehydrogenase isoenzyme in human cell cultures producing Mason-Pfizer monkey virus-like particles.
J. Natl. Cancer Inst. 53:751-757(1974)