IN RE APEX OIL COMPANY, ET AL., DEBTORS. APEX OIL COMPANY, ET AL., APPELLANTS, v. CLARK OIL REFINING CORPORATION, APPELLEE. No. 91-2833.United States Court of Appeals, Eighth Circuit.Submitted February 13, 1992. Decided March 6, 1992. Richard Ahrens, St. Louis, Mo., for appellants. Alan Salpeter, (Howard Roin and Lynn Thesing, on brief), Chicago, Ill., for appellee. […]