BASE-Bielefeld Academic Search Engine Modern Physics Letters B Modern Physics Letters B, World Scientific Publishing, 2020, 807, pp.135599. ⟨10.1016/j.physletb.2020.135599⟩ Physics Letters B Physics Letters Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 807, no. 807, p. 135599 (2020) The NA62 Collaboration Cortina Gil, Eduardo Husek, Tomas 2020 Search for heavy neutral lepton production in K+ decays to positrons Physics Letters B 807 135599 RODERIC: Repositorio Institucional de la Universitat de Valéncia Universitat de València RODERIC. Repositorio Institucional de la Universitat de Valéncia instname Physics Letters B, Vol 807, Iss, Pp 135599-(2020) Modern Physics Letters B, 2020, 807, pp.135599. ⟨10.1016/j.physletb.2020.135599⟩