AGREEMENT Pursuant to Rule 13d-1(f) under the Securities Exchange Act of 1934, each of the undersigned hereby agrees to the filing of this Statement on Schedule 13D/A on its behalf. This agreement may be signed in one or more counterparts.

   1


                                                            Page 19 of 20 Pages


                                   Exhibit A

                                   AGREEMENT

         Pursuant to Rule 13d-1(f) under the Securities Exchange Act of 1934,
each of the undersigned hereby agrees to the filing of this Statement on
Schedule 13D/A on its behalf.

         This agreement may be signed in one or more counterparts.

                                 Resource Investors Management Company Limited 
                                 Partnership
                                 By: RIMCO Associates, Inc.,
                                        Its General Partner


Date: January 16, 1998           By:   /s/  Xxx X. Xxxx
                                       ----------------------------------------
                                        Name:  Xxx X. Xxxx
                                        Title: President



                                 RIMCO Associates, Inc.


Date: January 16, 1998           By:   /s/  Xxx X. Xxxx
                                       ----------------------------------------
                                        Name:  Xxx X. Xxxx
                                        Title: President


                                 RIMCO Partners, L.P.
                                 By:  Resource Investors Management Company
                                      Limited Partnership,
                                        Its General Partner
                                        By:  RIMCO Associates, Inc.,
                                             Its General Partner


Date: January 16, 1998           By:   /s/  Xxx X. Xxxx
                                       ----------------------------------------
                                        Name:  Xxx X. Xxxx
                                        Title: President


                                 RIMCO Partners, X.X. XX
                                 By:  Resource Investors Management Company
                                      Limited Partnership,
                                        Its General Partner
                                        By:  RIMCO Associates, Inc.,
                                             Its General Partner

Date: January 16, 1998           By:   /s/  Xxx X. Xxxx
                                       ----------------------------------------
                                        Name:  Xxx X. Xxxx
                                        Title: President





   2


                                                            Page 20 of 20 Pages

                                 RIMCO Partners, L.P. III
                                 By:  Resource Investors Management Company
                                      Limited Partnership,
                                        Its General Partner
                                        By:  RIMCO Associates, Inc.,
                                        Its General Partner


Date: January 16, 1998           By:   /s/  Xxx X. Xxxx
                                       ----------------------------------------
                                        Name:  Xxx X. Xxxx
                                        Title: President


                                 RIMCO Partners, X.X. XX
                                 By:  Resource Investors Management Company
                                      Limited Partnership,
                                        Its General Partner
                                        By:  RIMCO Associates, Inc.,
                                        Its General Partner


Date: January 16, 1998           By:   /s/  Xxx X. Xxxx
                                       ----------------------------------------
                                        Name:  Xxx X. Xxxx
                                        Title: President


Date: January 16, 1998           /s/  Xxx X. Xxxx
                                 ----------------------------------------------
                                        Xxx X. Xxxx


Date: January 16, 1998           Xxxx X. XxXxxxxx *
                                 ----------------------------------------------
                                        Xxxx X. XxXxxxxx


Date: January 16, 1998           Xxxxx X. Xxxxxxx *
                                 ----------------------------------------------
                                        Xxxxx X. Xxxxxxx


Date: January 16, 1998           Xxxxxxx X. Xxxxx *
                                 ----------------------------------------------
                                         Xxxxxxx X. Xxxxx


Date: January 16, 1998           Xxxx X. Xxxxxxx *
                                 ----------------------------------------------
                                        Xxxx X. Xxxxxxx


By:   * /s/ Xxx X. Xxxx
    -------------------------
       Attorney-in-Fact