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Publisher
- kth, fotonik34
- optica publishing group19
- elsevier b.v.17
- institute of electrical and electronics engineers (ieee)16
- ieee15
- elsevier bv10
- rise res inst sweden, s-16440 kista, sweden.9
- riga tech univ, inst telecommun, lv-1048 riga, latvia.8
- institute of telecommunications, riga technical university, 1048 riga, latvia7