The Unique Blazar OJ 287 and Its Massive Binary Black Hole Central Engine by Lankeswar Dey, Achamveedu Gopakumar, Mauri Valtonen, Stanislaw Zola, Abhimanyu Susobhanan, Rene Hudec, Pauli Pihajoki, Tapio Pursimo, Andrei Berdyugin, Vilppu Piirola, Stefano Ciprini, Kari Nilsson, Helen Jermak, Mark Kidger, Stefanie Komossa

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