What is a good "standard" force for a momentary push-button?

Title says it all. I'm trying to find information about what is a
good range for the force needed to activate a momentary push-button
switch. My application is to build a custom "d-pad" style array like
you might find on a video game controller or personal electronics.
But I'd also appreciate any links to empirical studies or published
papers on the subject. I'm having trouble getting Google to even come
close to the topic... :T
Thanks,
-Will
.

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