How can I show a field if there are more then 3 authors?

edited 10 days ago
How can I show a field if there are more then 3 authors.

If i have 3 authors or less I need to show them in the beginning of enrty.
"John A.B., Smith E.D., Stone C.G. Book title"

If i have more then 3 I need to show them in the end
"Book title. John A.B. et al."

What condition can I use to show it only in this particular case?
I know how to hide (suppress-min), is there any opposite command?
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