Varghese, M.2007-05-162007-05-161997Geometric analysis and lie theory in mathematics and physics, 1997, 1997, Ch.5, pp.209-2429780521624909http://hdl.handle.net/2440/30551enL2 invariants of covering spacesBook chapter003000226966275Varghese, M. [0000-0002-1100-3595]