private void publicationCountStatistics() {
       Iterator i = Person.iterator();
       Person p;
       int l = Person.getMaxPublCount();
       int countTable[] = new int[l+1];
       int j, n;
       
       System.out.println();
       System.out.println("Number of publications: Number of persons");
       while (i.hasNext()) {
           p = (Person) i.next();
           countTable[p.getCount()]++;
       }
       n = 0;
       for (j=1; j <= l; j++) {
           if (countTable[j] == 0)
               continue;
           n++;
           System.out.print(j + ": " + countTable[j]+ "  ");
           if (n%5 == 0)
               System.out.println();
       }
       System.out.println();
   }