I couldn't access the additional background article, so I'm not sure what else has been done. Talk to a lawyer. File a civil suit against the owners. Look at your local statutes, codes, ordinances, etc., regarding nuisances and animals. Talk to your city councilmember. Get something on the council's regular meeting agenda and show up with your neighbors to address the city council. If all else fails, shoot the dogs if they come in your yard, but prepare for retaliation from the owners and hate mail from the animal lovers.
I'm not overly fond of people who keep dangerous animals for pets, and even less so of those who don't go to great lengths to keep them restrained. I don't know too many dog owners whose dogs do not get out from time to time (dig under or jump over the fence, yank their chain loose, go through a gate the kids forgot to close all the way, etc.), it happens even to very careful owners. Owners don't know how their Rottweiler, pit bull, presa or other large, powerful, potentially aggressive dog will react outside its little world when it encounters strangers (humans and other animals) and new environmental stimulants (rotating bicycle wheels, odd smells, sounds).
I've had a few personal encounters with some big dogs while cycling and managed to get away from all but two. A German Shepherd, that I actually knew quite well and wasn't trying to outrun, bit me on the leg before it realized it knew me and a Doberman slipped on the wet pavement just as it reached me and was run over by my rear wheel. Considering the number of dogs that have chased me, I consider myself quite lucky. I'm not as tolerant or as adventurous as I was when younger and if I'm carrying and perceive a dog as a threat I'll shoot it. If I'm not carrying and see no escape, I'll fight it to the death and hopefully be around to sue the owner for everything he/she has. Rant off.