1. Bivariate Order Polynomials

   • Matthias Beck
   • Maryam Farahmand
   • Sandra Zuniga Ruiz

   Original Paper 02 June 2020 Pages: 921 - 931

   

2. Regular and Vertex-Transitive Kähler Graphs Having Commutative Principal and Auxiliary Adjacency Operators

   • Toshiaki Adachi
   • Guanyuan Chen

   Original Paper 06 April 2020 Pages: 933 - 958

   

3. Commuting Involution Graphs for 4-Dimensional Projective Symplectic Groups

   • Alistaire Everett
   • Peter Rowley

   Original Paper Open access 04 June 2020 Pages: 959 - 1000

4. Flag-Transitive Block Designs and Finite Simple Exceptional Groups of Lie Type

   • Seyed Hassan Alavi

   Original Paper 09 April 2020 Pages: 1001 - 1014

5. On Near Polygons All Whose Hexes are Dual Polar Spaces

   • Bart De Bruyn

   Original Paper 02 April 2020 Pages: 1015 - 1041

6. Hamiltonian Cycle Properties in k-Extendable Non-bipartite Graphs with High Connectivity

   • Zhiyong Gan
   • Dingjun Lou
   • Yanping Xu

   Original Paper 03 April 2020 Pages: 1043 - 1058

7. Packing and Covering Directed Triangles

   • Jessica McDonald
   • Gregory J. Puleo
   • Craig Tennenhouse

   Original Paper 11 April 2020 Pages: 1059 - 1063

   

8. Degree Sequence Conditions for Maximally Edge-Connected and Super Edge-Connected Hypergraphs

   • Shuang Zhao
   • Yingzhi Tian
   • Jixiang Meng

   Original Paper 11 April 2020 Pages: 1065 - 1078

   

9. Circular Zero-Sum r-Flows of Regular Graphs

   • Saieed Akbari
   • Amir Hossein Ghodrati
   • Mohammad Ali Nematollahi

   Original Paper 11 April 2020 Pages: 1079 - 1092

   

10. Harmonic Index t-Designs in the Hamming Scheme for Arbitrary q

    • Makoto Tagami
    • Ryota Hori

    Original Paper 11 April 2020 Pages: 1093 - 1109

11. p-Adic Roots of Chromatic Polynomials

    • Paul Buckingham

    Original Paper 27 April 2020 Pages: 1111 - 1130

12. Repetition of Spectral Radiuses Among Connected Induced Subgraphs

    • Alberto Seeger

    Original Paper 05 May 2020 Pages: 1131 - 1144

    

13. Stirling Pairs of Permutations

    • Richard A. Brualdi

    Original Paper 15 May 2020 Pages: 1145 - 1162

    

14. Gallai–Ramsey Numbers for Rainbow Paths

    • Xihe Li
    • Pierre Besse
    • Noah Watts

    Original Paper 02 May 2020 Pages: 1163 - 1175

15. Unimodality of Principal Eigenvector and its Applications

    • Jie Xue
    • Ruifang Liu
    • Jinlong Shu

    Original Paper 02 May 2020 Pages: 1177 - 1188

16. A Generalization of Some Results on List Coloring and DP-Coloring

    • Keaitsuda Maneeruk Nakprasit
    • Kittikorn Nakprasit

    Original Paper 09 May 2020 Pages: 1189 - 1201

    

17. Consecutive Detecting Arrays for Interaction Faults

    • Ce Shi
    • Ling Jiang
    • Aiyuan Tao

    Original Paper 18 May 2020 Pages: 1203 - 1218

    

18. Which Graphs Occur as \(\gamma \)-Graphs?

    • Matt DeVos
    • Adam Dyck
    • Samuel Simon

    Original Paper 29 May 2020 Pages: 1219 - 1246

    

19. Richardson’s theorem in quasi-transitive and pre-transitive digraphs

    • Hortensia Galeana-Sánchez
    • Rocío Sánchez-López

    Original Paper 14 May 2020 Pages: 1247 - 1261

    

20. Comments on “On Integral Graphs Which Belong to the Class \(\overline{\alpha K_{a,b}}\)” [Graphs Comb. 19, 527–532 (2003)]

    • Milan Pokorný
    • Dragan Stevanović

    Original Paper 11 May 2020 Pages: 1263 - 1268