# Background These notebooks contain more theoretical explanations about the Astrodynamics concepts used in boinor. For further information, have a look at the books we recommend in the {ref}`bibliography`. ```{eval-rst} .. nbgallery:: /examples/comparing-hohmann-and-bielliptic-transfers.myst.md /examples/propagation-using-cowells-formulation.myst.md /examples/revisiting-lamberts-problem-in-python.myst.md /examples/studying-hohmann-transfers.myst.md /examples/multirevolutions-solution-in-lamberts-problem.myst.md ```