[1]
Caballar, R.C.F. and Galapon, E.A. 2009. Characteristic time operators for systems with degenerate energy spectrum. Proceedings of the Samahang Pisika ng Pilipinas, 27(1), SPP-2009-4C-01. URL: https://proceedings.spp-online.org/article/view/SPP-2009-4C-01.