Constantinescu, F., author
Pergamon Press, 1980
Buku Teks
Olivia Iolana, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2019
UI - Skripsi (Membership)
Cornwell, J.F., author
Academic Press, 1989
Buku Teks
Springer, 2012
eBooks
edited by S. Flugge
Springer-Verlag, 1958
Buku Referensi