Not an article, and I don't want to disrupt your request (if I find an article, I will certainly pass it along!), but one thing I've discovered that helps a lot in on-the-go serial writing: Create hooks for which you have absolutely no current plans. Example: In The Last Skull, I had Sue find one of the potions are missing in her bunker. I have no idea why. I still don't. But it will be relevant later.
I keep a notepad file with all the various 'hooks' I've seeded (either on purpose or accident) which work as foreshadowing. As I go, I start discovering purposes to use those hooks towards. The trick about this is--you want to make sure you use them, because if you don't, it looks sloppy and a good reader can instantly recognize what you've done (and you lose credibility).