Electrical transport properties of nanostructured ferromagnetic perovskite oxides La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3</sub>and La<sub>0.5</sub>Sr<sub>0.5</sub>CoO<sub>3</sub>at low temperatures (5 K ⩾<i>T</i>⩾ 0.3 K) and high magnetic field
New journal of physics