Analytic integrability of the Bianchi Class A cosmological models with   0<= k<1
  There are many works studying the integrability of the Bianchi class A cosmologies with k=1. Here we characterize the analytic integrability of the Bianchi class A cosmological models when 0<= k<1. 
Antoni Ferragut, Jaume Llibre and Chara Pantazi
math-ph math.DS math.MP