Mathur, Samir D. "What exactly is the information paradox? http://books.google.com/books?id=RfDUXYSSyA0C&pg=PA3." In Physics of Black Holes, pp. 3–48. Springer, Berlin, Heidelberg, 2009. (quote from p. 3)
“Quantum mechanics as it stands would be perfect if we didn't have the quantum-gravity issue and a few other very deep fundamental problems.”
Does Some Deeper Level of Physics Underlie Quantum Mechanics? An Interview with Nobelist Gerard 't Hooft http://blogs.scientificamerican.com/critical-opalescence/2013/10/07/does-some-deeper-level-of-physics-underlie-quantum-mechanics-an-interview-with-nobelist-gerard-t-hooft/
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Gerardus 't Hooft 8
Dutch theoretical physicist and Nobel Prize winner 1946Related quotes
"Testing Quantum Mechanics" http://www.sciencedirect.com/science/article/pii/0003491689902765, Annals of Physics (1989)
The Trouble With Physics: The Rise of String Theory, The Fall of a Science, and What Comes Next (2007)
"Loop Quantum Gravity," The New Humanists: Science at the Edge (2003)
Book Reviews, REVIEWER: JAKUB PALIDER, NANOSCALE COMMUNICATION NETWORKS STEPHEN F. BUSH, ARTECH HOUSE, 2010, ISBN-13: 978-1-60807-003-9, HARDCOVER, 308 PAGES, IEEE Communications Magazine, August 2011.
Does quantum mechanics carry the seeds of its own destruction? (1991)
W. E. Lamb, Super classical quantum mechanics: the best interpretation of non relativistic quantum mechanics, Am. J. Phys. 69, 413-422 (2001).
as quoted by John Hogan, in Quantum Philosophy, Scientific American (July 1992)
Source: Lectures on Quantum Mechanics (2012, 2nd ed. 2015), Ch. 3: General Principles of Quantum Mechanics