“…The weak point of the papers of Demidovich and Iseki consists of the fact that they demonstrate the boundedness of monotonous solutions, without specifying whether such solutions exist. Regarding the existence of monotonic solutions of differential equations, important results were obtained by Rovderová [3], Tóthová and Palumbíny [4], Rovder [5], Li and Fan [6], Yin [7], Ertem and Zafer [8], Aslanov [9], Chu [10], and Sanhan et al [11].…”