01. Vorläuf.Bericht zur Entwicklung eines Extensionsimplantates für den Unterkieferseitenzahnbereich aus multikristalliner Aluminiumoxidkeramik (II) Quintessenz 31:11-21 (1) 1980, Ehrl, P.A., Frenkel, G.
Translation Japanese Quintessence International, 9, 7-13 (1) 1981, Ehrl, P.A., Frenkel, G.
02. Oroantral Communication(OAC)-Epicritical Studies of 175 patients with special concern to the secondary operative closure.Int.J.Oral Surg.9: pp351, 1980, Ehrl, P.A.,
03. Experimental and clinical experiences with a blade-vent abutment of Al2O3-ceramic in the shorthened dental row situation in:Dental Implants, Materials and Systems, Hanser Verlag, München: 63-67 1980Ehrl, P.A., Frenkel, G.
04. Klinische Ergebnisse mit einem enossalen Extensions-implantat aus Al2O3-Keramik nach drei Jahren Quintessenz 11: 2007-14, 1981, Ehrl, P.A., Frenkel, G., chinese
05. Implants made of Al2O3-ceramic for the reconstruction of the terminal edentulous mandible Proceedings of the First World Biomaterials Congress 1982, Ehrl, P.A., Frenkel, G.
06. A clinical study of Al2O3-ceramic-implants for the reconstruction of the terminal edentulous mandible Biomaterials 1980, John Wiley &  Sons Ltd. 1982, Ehrl, P.A., Frenkel, G.
07. Al2O3-ceramic as material for dental implants Int. J. Oral Surg10: Suppl. 1: 93-98 1981,Ehrl, P.A., Reuther J., Frenkel, G.
08. Les implants en ceramo-alumine aujourd'hui Le chirurgien-dentiste de France 321: 29-36 1986, Ehrl, P.A.,
09. Transdental Fixation Using Moncrystalline Aluminum Oxide Ceramic Pins Extra Print: Progress in Dental Implantology 1988, Ehrl, P.A., Dörre, E.
10. L'uso della ceramica Biolox per la ritenzione di protesi totali Quintessence International 6-7, pp435, 1992, Ehrl, P.A.
11. Uzit¡ keramick‚ho Biolox - syst‚mu k retenci celkovych prot‚z Quintessenz, 1.rocnik, r¡jen, 350-358 1992, Ehrl, P.A.
12. Doswiadczenia w nawigacji implantologicznej po rocznym zastosowaniu, Ehrl, P.A.