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How to connect a word and a phrase with a dash?

Hello, I'm a non-native English speaker and I'm writing a scientific paper about biometric identification based on heart sounds.

In this context, is the following phrase correct?

Comparison of recent articles on heart sounds-based biometrics.

I am using it as a caption for a table.

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marked as duplicate by kiamlaluno, F'x, Robusto, RegDwigнt Mar 6 '11 at 15:12

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up vote 8 down vote accepted

The correct form would require another hyphen:

Comparison of recent articles on heart-sound(s)-based biometrics

However, such long compound adjectives are a bit ugly. Instead you could write this:

Comparison of recent articles about biometrics based on heart sounds.

Or perhaps this:

Comparison of recent articles on heart-sound biometrics

It seems clear that these biometrics are based on whatever word you use to specify them, which is why I suspect the word "based" isn't really necessary; or is it?

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No, it isn't necessary at all. Many thanks for the suggestions! –  Andrea Spadaccini Mar 4 '11 at 11:51
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