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important departure from conventional thinking in recent years, the holographic principle...provides a definition of quantum gravity...[and] guarantees that the whole process is unitary."
Gurzadyan, V. G.; Penrose, R. (2010). Concentric circles in WMAP data may provide evidence of violent pre-Big-Bang activity. 1011. pp. 3706. arXiv:1011.3706. Bibcode: 2010arXiv1011.3706G.
Hartle, James B. (1998). “Generalized Quantum Theory in Evaporating Black Hole Spacetimes”. Black Holes and Relativistic Stars: 195. arXiv:gr-qc/9705022. Bibcode: 1998bhrs.conf..195H.
Barbón, J. L. F. "Black holes, information and holography" J. Phys.: Conf. Ser. 171 01 (2009) doi:10.1088/1742-6596/171/1/012009http://iopscience.iop.org/1742-6596/171/1/012009 p.1: "The most
important departure from conventional thinking in recent years, the holographic principle...provides a definition of quantum gravity...[and] guarantees that the whole process is unitary."
The Black Hole War p. 10: "It was not a war between angry enemies; indeed the main participants are all friends. But it was a fierce intellectual struggle of ideas between people who deeply respected each other but also profoundly disagreed."
