Need references for magnetic force vs distance/angle topic

• I
Hi,

i'm finishing my final degree project, it's about a new type of pallet conveyor dragged by magnets.
I know for a fact that magentic force is inversely proportional to the distance squared, and i've designed and built my prototype with that in mind.
Now i'm writing my final report and i need to find actual scientific papers to use as reference when explaining that.
So, does anyone know a scientific paper or publicacion on the "magnetic force vs distance" topic?
I'm using regular neodymium magnets (no electromagnets or anything fancy).

Marc S~

$$\mathbf{F}=\nabla(\mathbf{m}\cdot\mathbf{B})$$