The thesis Massey goes for in this paper is, I think, very challenging. The analytic-synthetic distinction, which was ultimately left in the blur by twentieth century philosophy, is said to be eluded by the new concept of conceivability. There are arguments based on conceivability out there, and they are no less blurry than those based on analyticity. Such arguments are traced back to Hume. Unsurprisingly, thought experiemnts seem to be the prototypical example.
Massey, G. (1991). Backdoor analyticty. In T. Horowitz, & G. Massey (Eds.), Thought experiments in science and philosophy (pp. 285-296). Lanham: Rowman & Littlefield.
Read the article here.