@book { ProblemSolvinginMathematics,
    title = "Problem-Solving in Mathematics",
    subtitle = "A Semiotic Perspective for Educators and Teachers",
    author = "Marcel {Danesi}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1105666"
}