### Wolfgang Haken: A biographical sketch

#### Works connected to ~~Kenneth Ira Appel~~

#### Filter the Bibliography List

Every planar map is four colorable,” Bull. Am. Math. Soc. 82 : 5 (September 1976), pp. 711–712. MR 424602 Zbl 0331.05106 article

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Every planar map is four colorable, I: Discharging,”
Ill. J. Math.
21 : 3
(1977),
pp. 429–490.
A microfiche supplement to both parts was published in *Ill. J. Math.* **21**:3 (1977).
MR
543792
Zbl
0387.05009
article

Every planar map is four colorable, II: Reducibility,”
Ill. J. Math.
21 : 3
(1977),
pp. 491–567.
A microfiche supplement to both parts was published in *Ill. J. Math.* **21**:3 (1977).
MR
543793
Zbl
0387.05010
article

The class check lists corresponding to the supplement to ‘Every planar map is four colorable. Part I and Part II’,”
Ill. J. Math.
21 : 3
(1977),
pp. C1–C210.
Microfiche supplement.
Extra material to accompany the supplement published in *Ill. J. Math.* **21**:3 (1977).
MR
543794
article

Microfiche supplement to ‘Every planar map is four colorable. Part I and Part II’,”
Ill. J. Math.
21 : 3
(1977),
pp. 1–251.
Microfiche supplement.
Supplement to the two part article published as *Ill. J. Math.* **21**:3 (1977) and *Ill. J. Math.* **21**:3 (1977). A class check list was also published as *Ill. J. Math.* **21**:3 (1977).
MR
543795
article

Every planar map is four colorable. Contemporary Mathematics 98. American Mathematical Society (Providence, RI), 1989. With the collaboration of J. Koch. MR 1025335 Zbl 0681.05027 book

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