Please fill in the following items (except those marked by *;
11, 12, 14 are not necessary).

1. Author(s):
(in Roman spelling. Separate multiple authors by ;
for example: Ilf, I.A.; Petrov, Evgenii P.)

2. Email address of contact person:

3. Title of paper (in English):

4*. URL: http://www.MathSoc.spb.ru/preprint/1999/index.html#

5*. The paper is a preprint.

6. It is written in (language):

7. and coded as (format of the file):

8*. Series: St. Petersburg Mathematical Society Preprints

9. Date (year, month, day):

10. Primary MSC:
(AMS Mathematics Subjects Classification scheme index)

11. Secondary MSC (not necessary):

12. Keywords (separated by comma(s); not necessary):

13. Abstract (English, not more than 12 lines 80 characters yech):

14. Notes (not necessary):
Notes should not exceed 5 lines of 80 characters each. Notes could for
instance contain postal addresses of the authors, a remark whether the paper
originates from a theses, information on the revision history of the paper,
hints on work subsequent to the paper by the authors or others.