Urbán István;  Lozada Jaime L.;  Nagy Katalin;  Sanz Mariano: Treatment of severe mucogingival defects with a combination of strip gingival grafts and a xenogeneic collagen matrix: a prospective case series study.
  INTERNATIONAL JOURNAL OF PERIODONTICS & RESTORATIVE DENTISTRY, 35 (3).  pp. 345-353.  ISSN 0198-7569 (2015)