@article{jeffreys:1928:elw,
    author = {Jeffreys, Harold},
     title = {The effect on Love waves of heterogeneity in the lower layer},
   journal = {Monthly Notices Roy.~Astronom.~Soc.~Geophysical Supplement},
      year = {1928},
    volume = {2},
     pages = {101–111},
     zblno = {57.1596.02}}