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Number of items: **4**.

Bognár, János:
*Signature of the orthogonal companion in Kreĭn spaces.*
Acta scientiarum mathematicarum, (61) 1-4.
pp. 367-371. (1995)

Bognár, János:
*A proof of the spectral theorem for J-positive operators.*
Acta scientiarum mathematicarum, (45).
pp. 75-80. (1983)

Bognár, János:
*Star-algebras induced by non-degenerate inner products.*
Acta scientiarum mathematicarum, (39) 1-2.
pp. 15-26. (1977)

Bognár, János and Krámli, András:
*Operators of the form C*C in indefinite inner product spaces.*
Acta scientiarum mathematicarum, (29) 1-2.
pp. 19-29. (1968)