"A misprint in the coefficients of Hammud's scheme"

"A misprint in the coefficients of Hammud's scheme"
Al'shina E.A., Zaks E.M., Kalitkin N.N.

An interesting explicit sixth order seven-stage Runge-Kutta scheme was proposed in the literature. As a result of our testing, however, it was found that there exists a misprint in this scheme, which decreases its realistic convergence order down to the first one. We found and correct this misprint.