spanking

Okay, so I need some advice. I have, for most of my life, come from the school of thought that I got spanked as a kid and I turned out ok - therefore, I'm going to spank my kid. However, I know there's been some research out there that says that it can cause aggression or emotional problems. Only issue here is, I haven't come across an actual study that has anything tangible regarding the negative effect of spanking. Can anyone offer assistance? Anyone got any links to articles I should read or anything like that?