W. Bruckman et Ep. Esteban, AN ALTERNATIVE CALCULATION OF LIGHT BENDING AND TIME-DELAY BY A GRAVITATIONAL-FIELD, American journal of physics, 61(8), 1993, pp. 750-754
An alternative method is proposed to calculate light bending and time
delay in weak and strong gravitational fields. This approach is elemen
tary, straightforward and uses MATHEMATICA, a computer algebra system,
to perform the numerical calculations.