2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35403In several of the class A Bianchi models, minisuperspaces admit symmetries. It is pointed out that they can be used effectively to complete the Dirac quantization program. The resulting quantum theory provides a useful platform to investigate a number of conceptual and technical problems of quantum gravity.14 pagesGeneral Relativity and Quantum Cosmologytext