Meromorphic functions sharing two or three values with their derivatives in some angular domains. (English) Zbl 1315.30005
J. Contemp. Math. Anal., Armen. Acad. Sci. 49, No. 5, 241-250 (2014) and Izv. Nats. Akad. Nauk Armen., Mat. 49, No. 5, 53-66 (2014).