This page contains some nice links about education(some are in Dutch!)
Education
Quartertone Fingering Saxophone
Students repertoire | Johan van der Linden
Top-tone (recorder) fingering saxophone
TopTones for the Saxophone. Raschèr
Key names
TopTones for the Saxophone. Raschèr
33 pre-exercises for top-tones(nl)
Saxofoonspelen hoe doe je dat?
Alles wat je wilt weten over rieten