Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
It is in response to the invitation of Ye Editor that this paper has been prepared. Its object is, in brief compass, to point out some hiatuses in our knowledge of the ovulation process in vertebrates.
Hartman, Carl G.
"Process of Ovulation,"
Iowa State University Veterinarian: Vol. 5
, Article 2.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol5/iss4/2