@article{780041,
  author = {J. Zimmerman and Nolan Frederick},
  title = {Miniature Ultrasensitive Superconducting Magnetic Gradiometer and Its Use in Cardiography and Other Applications},
  year = {1971},
  number = {19},
  month = {1971-07-01 00:07:00},
  publisher = {Applied Physics Letters},
  language = {en},
}