JOINT FILING AGREEMENT

CUSIP NO. 00000X000
          ---------


                                    EXHIBIT A

                             JOINT FILING AGREEMENT


                  In accordance with Rule 13d-1(f) under the Securities Exchange
Act of 1934, as amended, the persons named below each hereby agrees that the
Schedule 13D filed herewith and any amendments thereto relating to the
acquisition of shares of the Common Stock of the Company is filed jointly on
behalf of each such person.

Dated:  February 11, 1998

                                            X.X. XXXXXX & CO.

                                            By: /s/ Xxxxx X. Xxxxxx
                                                --------------------------------
                                                Name:  Xxxxx X. Xxxxxx
                                                Title: President


                                            /s/ Xxxxx X. Xxxxxx
                                            ------------------------------------
                                            Xxxxx X. Xxxxxx


                                            /s/ Xxxxx X. Xxxxxx
                                            ------------------------------------
                                            Xxxxx X. Xxxxxx



                                            XXXXXX PARTNERS, L.P.

                                            By: XXXXXX CAPITAL CORPORATION
                                                its general partner


                                            By: /s/ Xxxxx X. Xxxxxx
                                                --------------------------------
                                                Name:  Xxxxx X. Xxxxxx
                                                Title: President



                                            XXXXXX CAPITAL CORPORATION

                                            By: /s/ Xxxxx X. Xxxxxx
                                                --------------------------------
                                                Name:  Xxxxx X. Xxxxxx
                                                Title: President


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