Combustion synthesis, characterization and metal-insulator transition studies of nanocrystalline La<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub> (0.0 ≤ x ≤ 0.5)
Low temperature synthesis, structural characterization, and zero-field resistivity of nanocrystalline La<sub>1-x</sub>Sr<sub>x</sub>MnO<sub>3+δ</sub> (0.0 ≤ x ≤ 0.3) manganites