Retracts in equiconnected spaces. Kwak, Jin Ho; Lee, Jaeun — 1993 International Journal of Mathematics and Mathematical Sciences
Congruence classes of orientable 2-cell embeddings of bouquets of circles and dipoles. Feng, Yan-Quan; Kwak, Jin-Ho; Zhou, Jin-Xin — 2010 The Electronic Journal of Combinatorics [electronic only]