Hy Seabeebu3, you could use a coil with a built in resistor and eliminate the ballast resistor, however you will only have the voltage that the coil puts out for all conditions. A circuit with a ballast resistor provides you with more voltage for starting, and a coil with a built in resistor can only put out the same amount of voltage all the time. As to links, I'm sorry I'm a mechanic not a confusilator guy, and I haven't got around to learning how to do that kind of thing yet. Maybe one of our gentlemen with better confusilator skills would post the link you seek.
