@article{KowLuzSkr10,
   author = {Kowalik, {\L}. and Lu\v{z}ar, B. and \v{S}krekovski, R.},
   title = {An improved bound on the largest induced forests for triangle-free planar graphs},
   journal = {Discrete Math. Theor. Comput. Sci.},
   volume = {12},
   number = {1},
   pages = {87--100},
   url = {https://dmtcs.episciences.org/487},
   year = {2010}
}