I wish to thank Dr. V. I. Shevtsov for help in preparing the figures;
and Prof. C. J. Lawn for helpful corrections to the paper. Also;
thanks are due to The Combustion Institute and the Russian Fund of Basic Research (grant no. 98-03-32158a and no. 98-03-42857) for the financial support of my participation in twenty-seventh Symposium (International) on Combustion;