Ferromagnetism in lacunar perovskite manganites Pr0.7Sr0.3-x xMnO3 and Pr0.7-x xSr0.3MnO3W. Boujelben, A. Cheikh-Rouhou and J. C. JoubertEur. Phys. J. B, 24 4 (2001) 419-423DOI: https://doi.org/10.1007/s10051-001-8693-2