Vasile Lauric
      Fuglede-Putnam theorem modulo the trace-class does not hold for almost normal operators with finite modulus of C_1-quasitriangularity
      International Journal of Mathematical Analysis, Vol. 8, 2014, no. 43, 2123-2128
      http://dx.doi.org/10.12988/ijma.2014.48243

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