Halin (1974). Halin, R. (1974), "A note on Menger's theorem for infinite locally finite graphs", Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg, 40: 111–114, doi:10.1007/BF02993589, MR0335355, S2CID120915644.
Halin (1971). Halin, R. (1971), "Studies on minimally n-connected graphs", Combinatorial Mathematics and its Applications (Proc. Conf., Oxford, 1969), London: Academic Press, pp. 129–136, MR0278980.
Diestel, Reinhard (December 7, 2014), Rudolf Halin 1934–2014, DMANET mailing list. Date corrected in a follow-up email from Diestel. Birthplace from his books Graphentheorie I, II.
Halin (1974). Halin, R. (1974), "A note on Menger's theorem for infinite locally finite graphs", Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg, 40: 111–114, doi:10.1007/BF02993589, MR0335355, S2CID120915644.
Halin (1974). Halin, R. (1974), "A note on Menger's theorem for infinite locally finite graphs", Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg, 40: 111–114, doi:10.1007/BF02993589, MR0335355, S2CID120915644.