References

• Adelman S.J., Pyper D.M., 1979, AJ 84, 1726 NASA ADS
• Albrecht R., Jenkner H., Weiss W.W., Wood H.J., 1977, A&A 58, 93 NASA ADS
• Babcock H.W., 1958, ApJS 3, 141 NASA ADS
• Bohlender D.A., Landstreet J.D., 1991 (priv. comm. to Mathys 1991)
• Bohlender D.A., Landstreet J.D., Thompson I.B., 1993, A&A 269, 355 NASA ADS
• Bonsack W.K., 1974, PASP 86, 408 NASA ADS
• Borra E.F., Beaulieu A., Brousseau D., Shelton I., 1985, A&A 149, 266 NASA ADS
• Borra E.F., Landstreet J.D., 1980, ApJS 42, 421 NASA ADS
• Bouchet P., 1989, Infrared Photometry, E.S.O. Operating Manual No. 11
• Bouchet P., Manfroid J., Schmider F.-X., 1991, A&AS 91, 424
• Brown D.N., Landstreet J.D., Thompson I.B., 1981, A magnetic survey of Ap stars in young clusters - Preliminary results. In: 23$^{\rm rd}$ Liège Astrophys. Coll.. Upper Main Sequence Chemically Peculiar Stars. Universitè de Liège, p. 195
• Catalano F.A., Leone F., 1993, A&AS 100, 319 NASA ADS
• Catalano F.A., Renson P., 1984, A&AS 55, 371 NASA ADS
• Catalano F.A., Renson P., 1988, A&AS 72, 1 NASA ADS
• Catalano F.A., Renson P., 1997, A&AS 121, 57 NASA ADS
• Catalano F.A., Kroll R., Leone F., 1991, A&A 248, 179 (CKL) NASA ADS
• Catalano F.A., Leone F., Kroll R., 1997, A&AS (in press)
• Catalano F.A., Renson P., Leone F., 1991, A&AS 87, 59 NASA ADS
• Catalano F.A., Renson P., Leone F., 1993, A&AS 98, 269 NASA ADS
• Deutsch A.J., 1958, Harmonic Analysis of the Periodic Spectrum Variables. In: Lehnert B. (ed.), Proc. I.A.U. Symp. 6, Electromagnetic Phenomena in Cosmical Physics. Cambridge University Press, Cambridge, p. 209
• Deutsch A.J., 1947, ApJ 105, 283 NASA ADS
• Dworetsky M.M., Trueman M.R.G., Stickland D.J., 1980, A&A 85, 138 NASA ADS
• Glagolevskii Yu.V., Bychkov V.D., Iliev I.K., Romanyuk I.I., Chunakova N.M., 1982, Pis'ma AZh 8, 26
• Hardie R.H., Reichmann E.J., Burke E.W.Jr., Hall D.S., 1990, J. Astrophys. Astron. 11, 277
• Hensberge H., 1993, Long Term Variability in CP stars. In: Dworetsky M.M., Castelli F., Faraggiana R. (eds.), Proc. I.A.U. Coll. 138, Peculiar versus Normal Phenomena in A-Type and Related Stars, ASP Conf. Ser. 44, 547
• Hensberge H., De Loore C., Zuiderwijk E.J., Hammerschlag-Hensberge G., 1977, A&A 54, 433
• Hensberge H., Sterken C., Van Der Linden Th., Hammerschlag-Hensberge G., 1978, A&AS 34, 67 NASA ADS
• Hoffleit D., Jaschek C., 1982, The Bright Star Catalogue, 4$^{\rm th}$ revised edition, Yale University Observatory
• Kameswara Rao N., Rajamohan R., 1982, Inf. Bull. Var. Stars 2121
• Lanz T., Mathys G., 1991, A&AS 90, 365 NASA ADS
• Leckrone D.S., 1976, Properties of Ap stars in the Ultraviolet. In: Weiss W.W., Jenkner H., Wood H.J. (eds.), Proc. I.A.U. Coll. 32, Physics of Ap Stars, Universitätssternwarte, Wien, p. 465
• Leckrone D.S., Fowler J.W., Adelman S.J., 1974, A&A 32, 237 NASA ADS
• Maitzen H.M., Wood H.J., 1977, A&A 58, 389 NASA ADS
• Manfroid J., Mathys G., 1985, A&AS 59, 429 NASA ADS
• Manfroid J., Renson P., 1980, Inf. Bull. Var. Stars 1824
• Manfroid J., Renson P., 1983, A&AS 51, 267 NASA ADS
• Manfroid J., Renson P., 1994, A&A 281, 73 NASA ADS
• Manfroid J., Sterken C., Bruch A., et al., 1991, First Catalogue of stars measured in the Long-Term Photometry of Variables Project 1982-1986, E.S.O. Scientific Report No. 8
• Mathys G., 1991, A&AS 89, 121 NASA ADS
• Mathys G., Manfroid, J., 1985, A&AS 60, 17 NASA ADS
• Megessier C., 1974, A&A 34, 53 NASA ADS
• Megessier C., 1975, A&A 39, 263 NASA ADS
• Megessier C., Garnier R., 1972, ApL 11, 113
• Morrison N.D., Wolff S.C., 1971, PASP 83, 474 NASA ADS
• North P., 1982, Inf. Bull. Var. Stars 2208
• North P., 1984, A&AS 55, 259 NASA ADS
• North P., Burnet M., 1991, Inf. Bull. Var. Stars 3635
• North P., Brown D.N., Landstreet J.D., 1992, A&A 258, 389 NASA ADS
• Preston G.W., Stepien K., 1968, ApJ 154, 971 NASA ADS
• Rakos K.D., Fiedler W., 1978, A&AS 31, 83 NASA ADS
• Renson P., 1978, Inf. Bull. Var. Stars 1391
• Renson P., Gerbaldi M., Catalano F.A., 1991, A&AS 89, 429 NASA ADS
• Steinitz R.W., 1964, Bull. Astron. Inst. Netherlands 17, 504
• Stepien K., 1968, ApJ 154, 945 NASA ADS
• Thompson I.B., Brown D.N., Landstreet J.D., 1987, ApJS 64, 219 NASA ADS
• Van Genderen A.M., 1964, Inf. Bull. Var. Stars 76
• Van Genderen A.M., 1965, Bull. Astron. Inst. Netherlands 18, 67
• Van Genderen A.M., 1967, Bull. Astron. Inst. Netherlands 19, 80
• Van Genderen A.M., 1971, A&A 14, 48 NASA ADS
• Winzer J.E., 1974, Thesis, University of Toronto
• Wood H.J., Campusano L.B., 1975, A&A 45, 303 NASA ADS