The Space Between Distinct Contours. - GERATHEWOHL, S. J.; CIBIS, P. A. (Periodicals Archive Online (PAO), 1953)
http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1016-1953-003-00-000009
Keywords: CL-CZ