Well, there is a whole Altissimo section at SOTW that any person could go through.
Unless someone is really clueless, picking up Altissimo techniques is not that hard.
Altissimo notes are just overtones that are in the Altissimo range which is anything higher that standard high F.
Altissimo is all about voicing and what is voicing, well, does anyone realize how many variations there are in approaching or preparing to play or playing a note, there are countless variations in air speed, the direction of the air ie up or down, in throat position in tongue position and embouchure position and hitting a certain Altissimo note or overtone requires a certain combination of the above or in other words a certain voicing.
There is really no one (in a book or elsewhere) that can tell a player where to position their tongue or throat or embouchure or what their air flow should be doing exactly.
The player can only be told general position and flow things and then the player has to feel out the voicing that works for a particular Altissimo note or overtone themselves.
Some players pick up Altissimo and overtone playing quicker than others and it's probably because they just have more feel for it, just like picking anything up, even bike riding or whatever.
Altissimo fingerings are just fingerings that might enable a certain Altissimo overtone to be played with maximum strength using a certain Altissimo fingering and the main part required is the voicing and not the Altissimo fingering.
It is possible to play overtones with any fingering up into the Altissimo range by just using voicing.
Anyway there are these general bits of advise on general positions or voicing to have a look at
Take a look at the "ALTISSIMO TECHNIQUE RECOMMENDATIONS" section in
http://www.google.com.au/url?q=http...jAAOAo&usg=AFQjCNEfscm7HLYts25jqXB-8s-xAsIQ0w
Take a look at the "Oral Cavity Manipulation" section in
http://www.google.com.au/url?q=http...jAHOB4&usg=AFQjCNHDtfq0dt5vn_Z9e3gHCEmD1L9ZfQ