@article{oai:tsukuba.repo.nii.ac.jp:00015799,
author = {Nastasescu, C. and Torrecillas, B.},
issue = {2},
journal = {Tsukuba journal of mathematics},
month = {Dec},
note = {The notion of graded coalgebra does not appear very frequently in the literature of coalgebras, neither in papers nor in books (e.g. the well known references [1], [10]). In the mentined books one can find considered the case when the group is Z and ...},
pages = {461--479},
title = {Graded coalgebras},
volume = {17},
year = {1993}
}