Steric effects in photochromic polysiloxanes with spirooxazine side groups Zelichenok, Alexander ; Buchholtz, Frida ; Yitzchaik, Shlomo ; Ratner, Judith ; Safro, Mark ; Krongauz, Valeri Abstract Publication: Macromolecules Pub Date: June 1992 DOI: 10.1021/ma00038a025 Bibcode: 1992MaMol..25.3179Z