@article{salchev:1976:pzc,
    author = {Salchev, L. Z. and Popov, V. B.},
     title = {A property of the zeros of cross-product {B}essel functions of
              different orders},
   journal = {Z. Angew. Math. Mech.},
    volume = {56},
      year = {1976},
    number = {2},
     pages = {120–121},
   mrclass = {33A40},
  mrnumber = {MR0419889 (54 \#7907)},
mrreviewer = {S. Saran},
       doi = {10.1002/zamm.19760560209},
     zblno = {0327.33005}}