[3] **viXra:1001.0031 [pdf]**
*submitted on 22 Jan 2010*

**Authors:** Dainis Zeps, Emanuels Grinbergs

**Comments:** 6 pages

We will call graph 1-H-graph if it is threeconnected and it has only one Hamiltonian circuit

**Category:** Combinatorics and Graph Theory

[2] **viXra:1001.0030 [pdf]**
*submitted on 22 Jan 2010*

**Authors:** Dainis Zeps

**Comments:** 61 pages

Tutorial

**Category:** Combinatorics and Graph Theory

[1] **viXra:1001.0029 [pdf]**
*submitted on 22 Jan 2010*

**Authors:** Dainis Zeps

**Comments:** 4 pages

4-critical wheel graphs of higher order are considered concerning their belonging
to free-planar or free-Hadwiger classes.

**Category:** Combinatorics and Graph Theory