Addis ababa: Ethiopia's President Taye Atske Selassie signed a book of condolences honouring the former President of Nigeria, Muhammadu Buhari.According to Ethiopian News Agency, the President noted that Buhari was a statesman whose leadership and service to Nigeria and his commitment to Africa will be remembered with highest reverence.Nigeria's former President died on Sunday in a London hospital at the age of 82. Buhari was buried in Daura, a town in the northern Katsina state.