Okay, here's something that's roaming for years on my mind and i have yet to find it.
It was a disney story. Mickey Mouse was starring. I think Goofy and Chief O'Hara were also in that story, but i'm not quite sure.
I remember reading only one chapter of that big story (i think it had 7 chapters) and it had something to do with a scientist that got lost one day. He told his wife that he was going out to buy something and then no signs of him were to be found.
The story had also something to do with UFOs or some type of aircraft maybe with the Bermuda Triangle too.

It has to be at least 20 years old and it was published on a Greek weekly magazine named "Mickey Mouse".
Does anyone know the story or knows a place where i can search for them?

You should check I.N.D.U.C.K.S. It's probably the best database to search Disney-stuff.

With Advanced Search you can search with hero + other characters, publish dates, reprint countries etc.

Did one search for test with mickey mouse + goofy + bermuda and it gave this story.

Absolutely fantastic website !

Unfortunately, it didn't help me find a very strange and irritating Mickey Mouse story that I had read in the 80s or the 90s in a greek Disney publication. It was a straightforward, summarized, adaptation (or rip-off) of "The Neverending Story", with no reference to either Michael Ende or Wolfgang Petersen. It had quite angered me at the time, and I'd love to find a trace of it, an aknowledgement or an explanation somewhere. Alas, even this database (with keywords like "mickey" "dragon" and/or "book") didn't find anything.

I did find this one: La storia (in)finita , (Story code: I TL 1883-A) , Parody of: La storia infinita (M. Ende)

That search is great but it does take time to get good results. X-)

keywords: päätymätön tarina + ende ('Päättymätön Tarina' translates to 'Neverending Story') X-)
I did have some memory of seeing this in Finnish Donald Duck album so that helped a bit.

OMFG!!!

It has to be this story!!! Thank you very much sir! Gonna have to find the english or greek version to check it out!

I actually have Finnish album that has this story and checked out.
Does this first part of story sound familiar?

Goofy acts weird and tells that a scientist told him "this&that" in dreams (He gets telepathic messages from missing scientist) and Mickey starts to investigate this scientist.
Mickey meets scientists wife and she shows Mickey a note ("Going out") that scientist left before disappearing.
Mickey gets a mission thru Chief O'Hara to search for this same scientist and it is said that he vanished during some sort of secret mission at Bermuda Triangle.
Mickey and Goofy (and Eega Beeva) gets airplane to fly to Bermuda Triangle and they vanish from radar too, and they are attacked by spaceships/ufos.
Eega Beeva helps them but airplane is damaged so they are forced to land nearby island.

I think that's the one, yes!

Thank you very much!