Outbout links to Authority sites

Last night I installed the insight plugin on my site and started posting an outbound link at the end of each article to an authority in my niche on the topic. And I had a couple stupid questions:

1. Obviously some of the keywords are very closely related so I have more than one article linking to the same wikipedia page, anything wrong with this?

2. Do I just want to stick to one authority site i'm linking to, such as wikipedia, or is it better to have many different ones?

I wouldn't go overboard on this. I think one authority link per post is probably too much and overkill. All you need is 2-3 authority OBLs per page and that's more than enough to tell Google that you're not just linking to spam sites. This is assuming you have less than 20 OBLs per page.

Well each post is it's own page. like domain.com/keyword1, domain.com/keyword2 etc.

1. Obviously some of the keywords are very closely related so I have more than one article linking to the same wikipedia page, anything wrong with this?

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yes, not a great idea, link to other things

2. Do I just want to stick to one authority site i'm linking to, such as wikipedia, or is it better to have many different ones?

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many different links, it would be better if you can link to a wide variety of websites and not link to the same website too many times, it's even better if you can link to high-authority websites in your niche (like webmd for health, or WSJ for finance)

started posting an outbound link at the end of each article

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Actually, it would be better if you don't always put the link in the same place - try putting it into the body of the article occasionally when it makes sense.

I think you should not do that. As long as you are doing white hat seo you should avoid this sort of activities. Rather you should do something obvious.

I usually link to 2 different sites. For each link. It helps but I think you will be ok with a single link too.