@article{Hideaki:2019,
author
=
"I.Hideaki and L.Li and J.Matkowski and M.Wróbel",
title
=
"Sandwich with periodicity",
journal
=
"Aequationes Mathematicae",
volume
=
"Vol. 93",
number
=
"iss. 4",
pages
=
"699--709",
year
=
"2019",
}