Check out his papers:
- J. Bunao and E.A. Galapon “A Relativistic One-Particle Time of Arrival Operator for a Free Spin-1/2 Particle in (1+1) Dimensions” Annals of Physics Vol. 356, Pages 369–382 (2015).
- J. Bunao and E.A. Galapon, “A one-particle time of arrival operator for a free relativistic spin-0 charged particle in (1+1)(1+1) dimensions”Annals of Physics, 353, 83-106 2015.
- J. Bunao and E.A. Galapon “The Bender-Dunne basis operators as Hilbert space operators”. J. Math. Phys. 55, 022102 (2014).
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Check out his latest preprint on quantum gravity: