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RT @SpringerMath: It's been 30 years since the 1st ed of M. Vuorinen's much-celebrated book and 90 years since H. Grötzsch's first paper in…
RT @SpringerMath: It's been 30 years since the 1st ed of M. Vuorinen's much-celebrated book and 90 years since H. Grötzsch's first paper in…
It's been 30 years since the 1st ed of M. Vuorinen's much-celebrated book and 90 years since H. Grötzsch's first paper in the field! https://t.co/f1D9DH1dnx https://t.co/1YoyGeO3dF