Observations and light curve solutions of three ultrashort-period WÂ UMa binaries
Keywords: بستن دوتایی; Binaries; Eclipsing binaries; Close binaries; Contact stars; Fundamental parameters; Individual (1SWASP J044132.96+440613.7; 1SWASP J052926.88+461147.5; NSVS 2175434);