الإتاحة: https://mouseion.jax.org/ssbb1962/787Test
الإتاحة: https://mouseion.jax.org/ssbb1971/1543Test
الإتاحة: https://mouseion.jax.org/ssbb1971/1179Test
الإتاحة: https://mouseion.jax.org/ssbb1960/815Test
الوصول الحر: http://www.osti.gov/scitech/biblio/4422905Test