Most of the advanced option trading books/manuals that I've searched through have strategies using a diagonal spread where the front month is sold and the farther out month is bought. I'm looking for any author who has a strategy where the front month is bought and the back month is sold. On top of which, a ratio where more options are bought in the front month than are sold in the back month. An example of what I'm looking for would be Long 4 June 2009 calls and Short 1 December 2009 call. Does anyone know who teaches this or at least discusses it?