Groups and clusters detection on DPOSS catalogs
  We discuss the implementation and validation of a procedure aimed to detect groups and clusters of galaxies in DPOSS catalogs. 
E. Puddu (1), E. De Filippis (1 and 2), V. Strazzullo (1), S. Andreon   (1), G. Longo (1), R. Gal (3), S. Djorgovski (3), R....