1. On Ramsey Numbers \(R(K_4-e, K_t)\)

   • Yu Jiang
   • Meilian Liang
   • Xiaodong Xu

   Original Paper 02 February 2021 Pages: 651 - 661

2. Induced Nets and Hamiltonicity of Claw-Free Graphs

   • Shuya Chiba
   • Jun Fujisawa

   Original Paper 12 February 2021 Pages: 663 - 690

   

3. Independent Domination Subdivision in Graphs

   • Ammar Babikir
   • Magda Dettlaff
   • Magdalena Lemańska

   Original Paper Open access 13 March 2021 Pages: 691 - 709

   

4. Lagrangian densities of short 3-uniform linear paths and Turán numbers of their extensions

   • Biao Wu
   • Yuejian Peng

   Original Paper 08 February 2021 Pages: 711 - 729

   

5. On \(K_{2,t}\)-Bootstrap Percolation

   • Mohammadreza Bidgoli
   • Ali Mohammadian
   • Behruz Tayfeh-Rezaie

   Original Paper 18 March 2021 Pages: 731 - 741

   

6. On 3-Bisections in Cubic and Subcubic Graphs

   • Davide Mattiolo
   • Giuseppe Mazzuoccolo

   Original Paper 27 January 2021 Pages: 743 - 746

   

7. Simultaneous Embedding of Colored Graphs

   • Debajyoti Mondal

   Original Paper 24 January 2021 Pages: 747 - 760

   

8. Matching Numbers and Dimension of Edge Ideals

   • Ayana Hirano
   • Kazunori Matsuda

   Original Paper 30 January 2021 Pages: 761 - 774

   

9. Weakly Protected Points in Ordered Trees

   • Lin Yang
   • Sheng-Liang Yang

   Original Paper 24 January 2021 Pages: 775 - 788

   

10. On L-Close Sperner Systems

    • Dániel T. Nagy
    • Balázs Patkós

    Original Paper Open access 12 February 2021 Pages: 789 - 796

11. N-Critical Matroids

    • J. P. Costalonga
    • S. R. Kingan

    Original Paper 02 February 2021 Pages: 797 - 803

12. Closure and Spanning Trees with Bounded Total Excess

    • Shun-ichi Maezawa
    • Masao Tsugaki
    • Takamasa Yashima

    Original Paper 24 February 2021 Pages: 805 - 822

    

13. Making a Tournament Indecomposable by One Subtournament-Reversal Operation

    • Houmem Belkhechine
    • Cherifa Ben Salha

    Original Paper 26 February 2021 Pages: 823 - 838

    

14. Toughness, Forbidden Subgraphs and Pancyclicity

    • Wei Zheng
    • Hajo Broersma
    • Ligong Wang

    Original Paper Open access 19 February 2021 Pages: 839 - 866

    

15. Affine Planes and Transversals in 3-Uniform Linear Hypergraphs

    • Michael A. Henning
    • Anders Yeo

    Original Paper 13 March 2021 Pages: 867 - 890

    

16. On Line Colorings of Finite Projective Spaces

    • Gabriela Araujo-Pardo
    • György Kiss
    • Adrián Vázquez-Ávila

    Original Paper 09 March 2021 Pages: 891 - 905

    

17. Peg Solitaire on Cartesian Products of Graphs

    • Martin Kreh
    • Jan-Hendrik de Wiljes

    Original Paper Open access 11 March 2021 Pages: 907 - 917

    

18. The Lower and Upper Bounds of Turán Number for Odd Wheels

    • Byeong Moon Kim
    • Byung Chul Song
    • Woonjae Hwang

    Original Paper 10 March 2021 Pages: 919 - 932

19. The Relation Between Hamiltonian and 1-Tough Properties of the Cartesian Product Graphs

    • Louis Kao
    • Chih-wen Weng

    Original Paper 10 March 2021 Pages: 933 - 943

    

20. A Characterization for Graphs Having Strong Parity Factors

    • Hongliang Lu
    • Zixuan Yang
    • Xuechun Zhang

    Original Paper 10 March 2021 Pages: 945 - 949

21. Strong Subgraph Connectivity of Digraphs

    • Yuefang Sun
    • Gregory Gutin

    Original Paper Open access 18 March 2021 Pages: 951 - 970

    

22. Domination for Latin Square Graphs

    • Behnaz Pahlavsay
    • Elisa Palezzato
    • Michele Torielli

    Original Paper 29 March 2021 Pages: 971 - 985

    

23. Half-Arc-Transitive Graphs and the Fano Plane

    • Martin Mačaj
    • Primož Šparl

    Original Paper 22 March 2021 Pages: 987 - 1012

    

24. The Edge-Connectivity of Token Graphs

    • J. Leaños
    • Christophe Ndjatchi

    Original Paper 25 March 2021 Pages: 1013 - 1023

    

25. Anti-Ramsey Number of Triangles in Complete Multipartite Graphs

    • Zemin Jin
    • Kangyun Zhong
    • Yuefang Sun

    Original Paper 26 March 2021 Pages: 1025 - 1044

    

26. Rainbow Monochromatic k-Edge-Connection Colorings of Graphs

    • Ping Li
    • Xueliang Li

    Original Paper 27 March 2021 Pages: 1045 - 1064

27. Shifted-Antimagic Labelings for Graphs

    • Fei-Huang Chang
    • Hong-Bin Chen
    • Zhishi Pan

    Original Paper 30 March 2021 Pages: 1065 - 1082

    

28. The Conjecture on the Crossing Number of \(K_{1,m,n}\) is true if Zarankiewicz’s Conjecture Holds

    • Xiwu Yang
    • Yizhen Wang

    Original Paper 05 April 2021 Pages: 1083 - 1088

    

29. The Weisfeiler–Leman Dimension of Chordal Bipartite Graphs Without Bipartite Claw

    • Ilia Ponomarenko
    • Grigory Ryabov

    Original Paper 25 March 2021 Pages: 1089 - 1102

    

30. A New Result on Spectral Radius and Maximum Degree of Irregular Graphs

    • Wenqian Zhang

    Original Paper 03 April 2021 Pages: 1103 - 1119

    

31. A Note on Spectral Radius and Maximum Degree of Irregular Graphs

    • Rongquan Feng
    • Wenqian Zhang

    Original Paper 05 April 2021 Pages: 1121 - 1127

32. Edge-Colored Complete Graphs Containing No Properly Colored Odd Cycles

    • Tingting Han
    • Shenggui Zhang
    • Ruonan Li

    Original Paper 04 April 2021 Pages: 1129 - 1138