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- A refinement of the Dress-Scharlau theorem. (Jang, Se Wook) J. Number Theory (2016), Vol 158, Pages 234-243
- 2-distance colorings of some direct products of paths and cycles. (Song, Byung Chul; Rho, Yoomi) Discrete Math. (2015), Vol 338, Pages 1730-1739
- L(3,2,1) -labeling for the product of a complete graph and a cycle. (Hwang, Woonjae; Song, Byung Chul) Taiwanese J. Math. (2015), Vol 19, Pages 849-859
- Radio number for the product of a path and a complete graph. (Hwang, Woonjae; Song, Byung Chul) J. Comb. Optim. (2015), Vol 30, Pages 139-149
- L(1,1) -labelling of the direct product of a complete graph and a cycle. (Rho, Yoomi; Song, Byung Chul) J. Comb. Optim. (2015), Vol 30, Pages 803-811
- L(h,k) -labelling for octagonal grid. (Rho, Yoomi; Song, Byung Chul) Int. J. Comput. Math. (2015), Vol 92, Pages 2243-2250
- The Kloosterman problem for binary Hermitian lattices. (Kim, Ji Young; Park, Poo-Sung) Abh. Math. Semin. Univ. Hambg. (2014), Vol 84, Pages 17-29
- New L(j,k) -labelings for direct products of complete graphs. (Song, Byung Chul; Rho, Yoomi; Hwang, Woonjae) Taiwanese J. Math. (2014), Vol 18, Pages 793-807
- Minimum orders of eulerian oriented digraphs with given diameter. (Rho, Yoomi; Hwang, Woonjae; Song, Byung Chul) Acta Math. Sin. (Engl. Ser.) (2014), Vol 30, Pages 1125-1132
- L(2,1)-labellings for direct products of a triangle and a cycle. (Song, Byung Chul; Rho, Yoomi) Int. J. Comput. Math. (2013), Vol 90, Pages 475–482
- Distance three labelings for direct products of three complete graphs. ( Song, Byung Chul; Hwang, Woonjae) Taiwanese J. Math. (2013), Vol 17, Pages 207–219
- Distance three labellings for K n ×K 2 . (Song, Byung Chul; Hwang, Woonjae) Int. J. Comput. Math. (2013), Vol 90, Pages 906-911
- The maximum radius of graphs with given order and minimum degree (Rho, Yoomi; Song, Byung Chul; Hwang, Woonjae) Discrete Math. (2012), Vol 312, Pages 207-212
- The exponent of a digraph and the diameter of its multiple direct product (Song, Byung Chul; Hwang, Woonjae) Linear Algebra Appl. (2012), Vol 437, Pages 2601-2612
- Van der Waerden's theorem on homothetic copies of {1,1+s,1+s+t}. (Rho, Yoomi) Integers (2012), Vol 12, Pages 877–893
- Sums of distinct integral squares in real quadratic fields (Park, Poo-Sung) C. R. Math. Acad. Sci. Paris (2011), Vol 349, Pages 497–500
- Even universal binary Hermitian lattices over imaginary quadratic fields (Kim, Ji Young; Park, Poo-Sung) Forum Math. (2011), Vol 23, Pages 1189-1201
- Exponents and diameters of strong products of digraphs (Song, Byung Chul; Hwang, Woonjae) Electron. J. Linear Algebra (2011), Vol 22, Pages 1106-1111
- Complete classification of binary normal regular Hermitian lattices (Kim, Ji Young; Park, Poo-Sung) J. Math. Soc. Japan (2011), Vol 63, Pages 1001-1025
- The fifteen theorem for universal Hermitian lattices over imaginary quadratic fields (Kim, Ji Young; Park, Poo-Sung) Math. Comp. (2010), Vol 79, Pages 1123–1144
- Corrigendum to "The exponent of Cartesian product of cycles'' (Song, Byung Chul; Hwang, Woonjae) Appl. Math. Lett. (2010), Vol 23, Pages 1314
- Exponents of Cartesian products of two digraphs of special orders (Rho, Yoomi) Bull. Korean Math. Soc. (2010), Vol 47, Pages 1155–1162
- The exponent of Cartesian product of cycles (Song, Byung Chul; Hwang, Woonjae) Appl. Math. Lett. (2009), Vol 22, Pages 561–564
- Hermitian lattices without a basis of minimal vectors (Park, Poo-Sung) Proc. Amer. Math. Soc. (2008), Vol 136, Pages 3041–3044
- Wielandt type theorem for Cartesian product of digraphs (Song, Byung Chul; Hwang, Woonjae) Linear Algebra Appl. (2008), Vol 429, Pages 841–848
- Extensions of representations of integral quadratic forms (Chan, Wai Kiu; Kim, Myung-Hwan; Oh, Byeong-Kweon) Ramanujan J. (2008), Vol 17, Pages 145–153
- Primitive graphs with given exponents and minimum number of edges (Song, Byung Chul; Hwang, Woonjae) Linear Algebra Appl. (2007), Vol 420, Pages 648–662
- The 2-color relative linear van der Waerden numbers (Rho, Yoomi) C. R. Math. Acad. Sci. Paris (2007), Vol 345, Pages 183–186
- A finiteness theorem for representability of quadratic forms by forms (Kim, Myung-Hwan; Oh, Byeong-Kweon) J. Reine Angew. Math. (2005), Vol 581, Pages 23–30
- Nonnegative primitive matrices with exponent 2 (Song, Byung Chul; Hwang, Woonjae) Linear Algebra Appl. (2005), Vol 407, Pages 162–168
- Universal octonary diagonal forms over some real quadratic fields Comment. Math. Helv. (2000), Vol 75, Pages 410–414
- Finiteness of real quadratic fields which admit positive integral diagonal septanary universal forms Manuscripta Math. (1999), Vol 99, Pages 181–184
- $2$-universal positive definite integral quinary quadratic forms (Kim, Myung-Hwan; Oh, Byeong-Kweon) Contemp. Math. (1999), Vol 249, Pages 51–62
- $2$-universal positive definite integral quinary diagonal quadratic forms (Kim, M.-H.; Raghavan, S.) Ramanujan J. (1997), Vol 1, Pages 333–337
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