@article{Fiedorowicz:2021,
author
=
"A.Fiedorowicz and E.Sidorowicz and E.Sopena",
title
=
"Proper connection and proper-walk connection of digraphs",
journal
=
"Applied Mathematics and Computation",
volume
=
"Vol. 410",
pages
=
"1--15",
year
=
"2021",
}