Ponnusamy, S. and Wirths, K.-J. 2014. On the problem of Gromova and Vasil’ev on integral means, and Yamashita’s conjecture for spirallike functions. Annales Fennici Mathematici. 39, 2 (Aug. 2014), 721–731. DOI:https://doi.org/10.5186/aasfm.2014.3922.