V.G. Prokhorov, V.A. Komashko, G.G. Kaminsky, V.L. Svetchnikov, H.W. Zandbergen, Y.P. Lee, J.S. Park, and K.W. Kim, Observation of the strain-driven charge-ordered state in La_0.7Ca_0.3MnO_3-d thin film with oxygen deficiency: Электpонные свойства металлов и сплавов, Low Temp. Phys. 29, (2002) [Fiz. Nizk. Temp. 29, 161-168, (2002)].