1
https://cholangson.vn/topic/137059-kham-pha-gia-cua-thep-van-go-koffmann-co-dat-khong/
2
https://forum.duytan.edu.vn/sites/index.aspx?p=forum_thread&forum=1145&thread=757517#p0
3
http://michiganlearn.org/threads/mach-ban-gia-chinh-hang-cua-sat-gia-go-koffmann.73685/
4
https://phonggiaothuy.edu.vn/threads/201375/
5
http://cuathepgiago.blogspot.com/2018/07/danh-sach-gia-ca-cua-cac-loai-cua-tren-thi-truong.html
6
http://cuathepvango.zohosites.com/blogs/post/giai-thich-gia-cua-thep-van-go-koffmann-co-re-khong
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