@article{700693,
     title = {Problems and remarks on contractibility of curves},
     booktitle = {General topology and its relations to modern analysis and algebra IV},
     series = {GDML\_Books},
     publisher = {Society of Czechoslovak Mathematicians and Physicist},
     address = {Praha},
     year = {1977},
     pages = {72-76},
     mrnumber = {MR0464197},
     zbl = {0373.54029},
     url = {http://dml.mathdoc.fr/item/700693}
}

Charatonik, J. J. Problems and remarks on contractibility of curves, dans General topology and its relations to modern analysis and algebra IV, GDML_Books,  (1977), pp. 72-76. http://gdmltest.u-ga.fr/item/700693/