G. Fan and H.A. Kierstead, The Square of Paths and Cycles, J. Combin. Theory Ser. B 63, 55-64, 1995.
August 14, 1997. Tommy R. Jensen
A. Sánchez-Arroyo, A new upper bound for total colourings of graphs, Discrete Math. 138, 375-377, 1995.
August 25, 1997. Tommy R. Jensen
M. Stiebitz, The forest plus stars colouring problem, Discrete Math. 126, 385-389, 1994.
August 26, 1997. Tommy R. Jensen
H.P. Yap, Total Colourings of Graphs, Lecture Notes in Mathematics 1623, Springer 1996.
The year given in the reference "Yap[1989b]" seems to be wrong. In the Preface of his book, Yap mentions that the first draft was completed in October 1991.
August 11, 1997. Tommy R. Jensen and Bjarne Toft