While the Wikipedia article indicates many types of extended vocal techniques, their notations are not available.
Despite hearing such effects in modern pieces, I've never had the chance of knowing how they are notated. I only know that ghost notes represent speech rather than singing, and the ghost notes and the mezza voce notation indicate a whisper-like sound.
Let's say, how should we notate that a part should be sung by inhaling, whispering, growling or screaming?
Are there any signs for this? Should the techniques be just written in words as an indication? Is there a guide or notation manual that tells how to notate such techniques?