@misc{calteches270,
         address = {Pasadena, CA},
          editor = {Edward Hutchings, Jr.},
           title = {Engineering and Science, Volume 31:4, January 1968},
          number = {4},
       publisher = {California Institute of Technology},
            year = {1968},
         journal = {Engineering and Science},
           month = {January},
          volume = {31},
             url = {https://resolver.caltech.edu/CaltechES:31.4.0}
}