1. Cellular extracts as protective agents for frozen Escherichia coli;Ambrosini;M.S. Thesis, Illinois Institute of Technology, Chicago,1964
2. Survival of Escherichia coli frozen in cell extracts;Ambrosini,1963
3. A study of some factors related to the survival of frozen Escherichia coli;Basa;M.S. Thesis, Illinois Institute of Technology, Chicago,1961
4. Frozen storage and certain life processes of Escherichia coli;Bretz;Ph.D. Thesis, Purdue University, Lafayette, Indiana,1958
5. Death of Escherichia coli frozen on cellophane and on membrane filters;Bretz;Canad. J. Microbiol.,1961