Friessnegg, T, B Nielsen, V.J Ghosh, A.R Moodenbaugh, S Madhukar, S Aggarwal, D.J Keeble, E.H Poindexter, P Mascher, and Ramamoorthy Ramesh. "Defect identification in (La, Sr)CoO3-δ using positron annihilation spectroscopy." Materials Research Society Symposium - Proceedings. Vol. 541. 1999. 161–165.