A part of a thesis, I need to design a couple auditory notifications in a car. Something along the lines of "check tire pressure", which isn't a warning. I have written down some relatively vague guidelines on how to design a notification from few books and by analyzing existing ones for comparison. I can dissect them and for example say "I think the short melody should be in major key", but there's almost no literature on that. You can find a lot more on actual warnings.
Where can I find studies and maybe usability tests specifically on notifications? Thanks