The gradual extension of reservation benefits to middle castes in India can be considered a case of bureaucratic clietlism. The reservation was first meant only for Scheduled Castes and Scheduled Tribes. The spread of vote bank politics has something to do with the reach of reservation to the upper sections. 

sample papers

http://www.jstor.org/stable/4140822

http://www.tandfonline.com/doi/abs/10.1080/00220388.2011.561330#.U-_2a8W-OSo

Thanks a lot. 

There is more of this kind of stuff in the works of Steven Levitsky (informal institutions in Latin America) and in Peter Mair, about organizational patronage within political parties.

In Argentina

http://www.derecho.uba.ar/investigacion/investigadores/scherlis.php

Muchas gracias, los estudios suenan realmente muy interesantes

de nada

In Japan, the keyword is "amakudari". It's not that big anymore, but you will find a huge body of literature from around the 1980s-90s.