by Ma, Ruyun, Lu, Yanqiong
Published in Advances in difference equations (27.06.2012)

by Kitamura, Yuichi, Kusano, Takaši, Lalli, B. S.
Published in Georgian Mathematical Journal (01.01.1995)

by Tang, Mei-Lan, Liu, Xin-Ge
Published in Advances in difference equations (21.11.2011)

by Blass, Andreas
Published in arXiv.org (23.08.2019)

by Xu, Changjin, Li, Peiluan, Shao, Yuanfu
Published in Advances in difference equations (20.06.2012)

by Caraballo, David G.
Published in Taiwanese journal of mathematics (01.02.2012)

by Cubiotti, Paolo, Yao, Jen-Chih
Published in Taiwanese journal of mathematics (01.10.2011)

by Zhao, Xinyu, Protas, Bartosz
Published in arXiv.org (18.02.2024)

by Prasad, K.R, Murali, P, Rao, S. Nageswara
Published in International journal of difference equations (01.12.2009)

by Epstein, Charles L
Published in arXiv.org (22.01.2024)

by Zhao, Junfang, Lian, Hairong, Ge, Weigao
Published in Boundary value problems (17.01.2012)

by Duggal, K. L.
Published in Acta applicandae mathematicae (01.01.2007)

by Tatar, Nasser-eddine
Published in Advances in difference equations (29.06.2011)

by Xing, Yepeng, Fu, Yi
Published in Advances in difference equations (01.12.2011)

by Ghosh, Sourangshu
Published in arXiv.org (04.01.2021)

by Mihailescu, Mihai, Repovs, Dusan
Published in Bulletin of the Belgian Mathematical Society, Simon Stevin (01.01.2011)

by Li, Hongliang, Zhao, Min, Yuan, Rong
Published in arXiv.org (01.06.2023)

by Agarwal, Ravi P, O'Regan, Donal, Wong, Patricia JY
Published in Advances in difference equations (11.10.2011)

by Boucenna, Djalal, Chidouh, Amar, Torres, Delfim F M
Published in arXiv.org (16.06.2022)

by Dinca, George, Mawhin, Jean
Published in Bulletin of the Belgian Mathematical Society, Simon Stevin (01.05.2010)