[gothic-l] The vocative in Gothic

[roellingua@gmail.com [gothic-l]]

Does anyone have a grammatical explanation, which I can't seem to easily find, about the vocative in Gothic?
 

 What I found is:  magus, has the singular vocative ==> magau
 

 So I guess that u-stem nouns turn into the dative singular form when you speak directly to a person and mention him/her.
 

 The word dags has  ==> dag
 

 So singular a-stem nouns turn into the accusative form, generally.
 

 atta ==> atta,  so n-stem nouns turn in the nominative singular form, generally.
 

 Does anyone know more about it?
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