Finite two-distance tight frames. Barg, A., Glazyrin, A., Okoudjou, K. A., & Yu, W. Linear Algebra Appl., 475:163–175, 2015.
Finite two-distance tight frames [link]Paper  doi  bibtex   
@article {bar15,
    AUTHOR = {Barg, Alexander and Glazyrin, Alexey and Okoudjou, Kasso A.
              and Yu, Wei-Hsuan},
     TITLE = {Finite two-distance tight frames},
   JOURNAL = {Linear Algebra Appl.},
  FJOURNAL = {Linear Algebra and its Applications},
    VOLUME = {475},
      YEAR = {2015},
     PAGES = {163--175},
      ISSN = {0024-3795},
   MRCLASS = {42C15},
  MRNUMBER = {3325226},
MRREVIEWER = {Faina I. Solov\cprime eva},
       DOI = {10.1016/j.laa.2015.02.020},
       URL = {https://doi-org.proxy-um.researchport.umd.edu/10.1016/j.laa.2015.02.020},
}

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