The PG star is MM Hya = GSC 4891-0637 (not 0637-4891). It appears in Ritter & Kolb's sixth catalogue of CVs and x-ray binaries. Here is the last five years of the SIMBAD biblio for the object: 1998A&AS..129...83R: RITTER H. and KOLB U. <Astron. Astrophys., Suppl. Ser., 129, 83-85 (1998)> Catalogue of cataclysmic binaries, low-mass X-ray binaries and related objects (Sixth edition). Comments: J1910-5958 1 and 2 = CL* NGC 6752 BRS 1 and 2, 0021-7221 = Cl* NGC 104 PD V2, V3 in 47 Tuc = Cl* NGC 104 PD V3, J2316 Do you want to see more ? -05 = 1RXS J231603.9-052713, J0501-03 = RE J0501-03, J1724+41 = 1RXS J172405.7+411402, J0953+14 = EQ J0953+14, J1744-2844 = GRO J1744-28, J1745-2910 = AX J1745.6-2901, J2130+4710 = RX J2130.6+4710, J0153+7442 = RX J0153.3+7446 Notes: Available at CDS: abstract, <CDS Catalogue: V/99> 1998PASP..110.1132P: PATTERSON J. <Publ. Astron. Soc. Pac., 110, 1132-1147 (1998)> Late evolution of cataclysmic variables. Notes: Available at CDS: abstract 1998Ap&SS.257..183L: LIU W., LI Z.Y. and HU J.Y. <Astrophys. Space Sci., 257, 183-199 (1998)> EG Cancri: a new WZ Sge type dwarf nova. 1997PASP..109..345D: DOWNES R., WEBBINK R.F. and SHARA M.M. <Publ. Astron. Soc. Pac., 109, 345-440 (1997)> A catalog and atlas of cataclysmic variables-second edition. Comments: Table 1: format 'CCC' not in SIMBAD, use the cross-id. in other col. In ref list: Margon 1985PASP.97.962 instead of 912. Do you want to see more ? Notes: Available at CDS: abstract, <CDS Catalogue: V/94> Dictionary: Table 1: <[DWS97] CCC N> N=154 1997IBVS.4471....1K: KAZAROVETS E.V. and SAMUS N.N. <IAU Inform. Bull. Var. Stars, 4471, 1-45 (1997)> The 73rd name-list of variable stars. Notes: Available at CDS: <CDS Catalogue: II/195> 1996A&AS..117..449Z: ZWITTER T. and MUNARI U. <Astron. Astrophys., Suppl. Ser., 117, 449-465 (1996)> CCD spectrophotometry of CVs. III. 3270-9000A atlas for 38 faint systems. Notes: Available at CDS: abstract 1995AJ....109.1757M: MISSELT K.A. and SHAFTER A.W. <Astron. J., 109, 1757-1769 (1995)> Time-resolved photometry of a sample of Palomar-Green cataclysmic variable candidates. 1994A&AS..107..503Z: ZWITTER T. and MUNARI U. <Astron. Astrophys., Suppl. Ser., 107, 503-514 (1994)> CCD spectrophotometry of CVs. I. 4600-9000A low resolution atlas for 31 faint systems. Notes: Available at CDS: abstract \Brian