Nature-based solutions in the urban context: terminology, classification and scoring for urban challenges and ecosystem services. - Joana A. C. Castellar; Lucia Alexandra Popartan; Josep Pueyo-Ros; Natasa Atanasova; Gunter Langergraber; Ina Saumel; Lluís Corominas; Joaquim Comas; Vicenç Acuña (CoRR, 2021)