It's easy to discuss and present Senegalese literature in a vacuum, or merely demonstrate how it manifests the notion of Négritude (Senghor) and reflects the rising power of women in Africa (Bâ).
But there are also cultural issues which descend to us from its colonial history, its faltering educational system, and its position as the westernmost of Africa's nations, yet one that looks solidly away from the West for trade relationships.
If you'd like to situate Senghor and Bâ in those spheres, these articles and anthology may help:
A Brief Introduction to African literature
Birth of a Nation? The Origins of Senegalese Literature in French
Langston Hughes' An African Treasury (an anthology of work from Africa)